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Specifications Specifications 10/27/2021
Products: AS-B
Functionalities: Engineering, Hardware
Product version: 3.3

AS-B

AS-B server

AS-B server

Introduction

At the core of an EcoStruxure BMS is an automation server, such as the SpaceLogic* AS-B server. The AS-B server performs key functionality, such as control logic, trend logging, and alarm supervision, provides built-in I/O, and supports communication and connectivity to the field buses. The distributed intelligence of the EcoStruxure BMS helps ensure fault tolerance against detected faults and provides a fully featured user interface through WorkStation and WebStation.

* Formerly known as SmartX.

Features

The AS-B server is a powerful device with built-in power supply and I/O. The AS-B server can act as a standalone server using its built-in I/O and also monitor and manage field bus devices. In a small installation, the embedded AS-B server acts as a standalone server, mounted in a small footprint. In medium and large installations, functionality is distributed over multiple automation servers that communicate over TCP/IP.

Communications hub

Capable of coordinating traffic from above and below its location, the AS-B server can deliver data directly to you or to other servers throughout the site. The AS-B server can run multiple control programs, manage built-in I/O, alarms, and users, handle scheduling and logging, and communicate using a variety of protocols. Because of this, most parts of the system function autonomously and continue to run as a whole even if communication is interrupted or individual EcoStruxure BMS servers or devices go offline.

Models

The AS-B server comes in four models with different I/O point count and I/O mix.

Model

I/O Points

AS-B-24

24

AS-B-24H

24

AS-B-36

36

AS-B-36H

36

AS-B servers with “H” in the product name are equipped with a display for output override.

AS-B servers with 36 I/O points have the same small footprint as AS-B servers with 24 I/O points.

Versatile and flexible mix of I/O points

The AS-B server offers a mix of I/O point types that match a wide variety of HVAC applications. Most of the I/O points are universal inputs/outputs, which are highly flexible and can be configured as either inputs or outputs.

AS-B servers with 24 I/O points have the following types:

  • 12 Universal inputs/outputs, Ua type

  • 4 Universal inputs/outputs, Ub type

  • 4 Digital inputs

  • 4 Relay outputs

AS-B servers with 36 I/O points have the following types:

  • 20 Universal inputs/outputs, Ua type

  • 8 Universal inputs/outputs, Ub type

  • 4 Triac outputs

  • 4 Relay outputs

Universal inputs/outputs

The universal inputs/outputs are ideal for any mix of temperature, pressure, flow, status points, and similar point types in a building control system.

The universal inputs/outputs can be configured to read several different types of inputs:

  • Digital

  • Counter

  • Supervised

  • Voltage

  • Current (Ub only)

  • Temperature

  • Resistive

  • 2-Wire RTD temperature

  • 2-Wire RTD resistive

As counter inputs, the universal inputs/outputs are commonly used in energy metering applications. As RTD inputs, they are ideal for temperature points in a building control system. As supervised inputs, they are used for security applications where it is critical to know whether or not a wire has been cut or shorted. These events provide a separate indication of alarms and events in the system.

For all analog inputs, maximum and minimum levels can be defined to automatically detect over-range and under-range values.

The universal inputs/outputs are capable of supporting analog outputs of type voltage outputs. Therefore, the universal inputs/outputs support a wide range of devices, such as actuators.

Digital inputs

The digital inputs can be used for cost effective sensing of multiple dry contact digital inputs in applications, such as equipment status monitoring or alarm point monitoring. As counter inputs, digital inputs are commonly used in energy metering applications.

Relay outputs

The relay outputs support digital Form A point types. The Form A relays are designed for direct load applications.

Triac outputs

The triac outputs can be used in many applications to switch 24 VAC on or off for external loads such as actuators, relays, or indicators. Triacs are silent and do not suffer from relay contact wear.

I/O expansion

For applications that require more I/O resources, the SpaceLogic IP-IO modules provide a versatile mix of I/O points for any application. For more information, see the SpaceLogic IP-IO Specification Sheet.

Manual override function

AS-B servers with “H” in the product name are equipped with an LCD display and keys to support manual override control of analog and digital outputs. This function allows you to manually override the outputs for testing, commissioning, and maintenance of equipment.

The override status is readable through EcoStruxure Building Operation WorkStation and WebStation, enabling precise monitoring and more reliable control.

Built-in power supply

The device has a built-in power supply designed to accommodate 24 VAC or 24 VDC input power. The main AC/DC input (L/+ and N/-) is galvanically isolated from the electronics. This removes the risk of damage due to earth currents and permits the input power to be wired without concern for polarity matching.

Variety of connectivity options

An AS-B server has numerous ports that enable it to communicate with a wide range of protocols, devices, and servers.

An AS-B server has the following ports:

  • Two 10/100 Ethernet ports

  • One RS-485 port

  • One USB device port

  • One USB host port

The first Ethernet port is dedicated to the site network. The second Ethernet port is fully configurable. The second port can be configured to extend the site network so that various devices and clients can be connected. Another option is to configure the second port as a separate network, which means that the port can host a private network or act as a client to a second site network. If the second port is not used, it can be disabled.

The USB device port allows you to upgrade and interact with the AS-B server using Device Administrator.

Using a USB Ethernet adapter, you can connect a laptop PC to the USB host port and run Device Administrator, WorkStation, and WebStation to upgrade, configure, and access the AS-B server. The USB host port can also be used to provide power and communications for the SpaceLogic Zigbee Adapter.

Zigbee wireless network support

Through the SpaceLogic Zigbee Adapter connected to the host USB port, Zigbee TM wireless connectivity can be enabled for the automation server. The automation server can extend its point count through the Zigbee wireless network and bring flexibility in your applications. For more information on the Zigbee Adapter and supported wireless devices, see the SpaceLogic Zigbee Adapter Specification Sheet.

Authentication and permissions

An EcoStruxure BMS provides a powerful permission system that is easy to manage, flexible, and adapts to all kinds of system sizes. The permission system provides a high standard of authentication. Authentication is done against the built-in user account management system or against Windows Active Directory Domains. The built-in account management system allows an administrator to establish password policies that meet stringent cybersecurity guidelines. When Windows Active Directory is used, the administration costs are lower because users do not have to be managed in multiple directories.

WorkStation/WebStation interface

Through any client, the user experience is similar regardless of which EcoStruxure BMS server the user is logged on to. The user can log directly on to an AS-B server to engineer, commission, supervise, and monitor the AS-B server and its built-in I/O as well as its attached field bus devices. See the WorkStation and WebStation specification sheets for additional information.

Open building protocol support

One of the cornerstones of the EcoStruxure BMS is support for open standards. The AS-B server can natively communicate with two of the most popular standards for buildings: BACnet and Modbus.

Native BTL-listed BACnet support

An AS-B server communicates directly to BACnet/IP and BACnet MS/TP networks. The AS-B servers are BTL-listed as BACnet Building Controllers (B-BC), the most advanced BACnet Device Profile. This capability provides access to an extensive range of BACnet devices from Schneider Electric and other vendors. See the BTL Product Catalog for up-to-date details on BTL listed firmware revisions on BACnet International's home page. An AS-B server can also serve as a BACnet Broadcast Management Device (BBMD) to facilitate BACnet systems that span multiple IP subnets.

Native Modbus support

The AS-B server natively integrates Modbus RS-485 master and slave configurations, as well as Modbus TCP client and server. This allows full access to third-party products and the range of Schneider Electric products that communicate on the Modbus protocol, such as power meters, UPS, circuit breakers, and lighting controllers.

Web Services support

The AS-B server supports the use of Web Services based on open standards, such as SOAP and REST, to consume data into the EcoStruxure BMS. Use incoming third-party data (temperature forecast, energy cost) over the Web to determine site modes, scheduling, and programming.

EcoStruxure Web Services support

EcoStruxure Web Services, Schneider Electric’s Web Services standard, is natively supported in the EcoStruxure BMS servers. EcoStruxure Web Services offers extra features between compliant systems whether within Schneider Electric or other authorized systems. These features include system directory browsing, read/write of current values, alarm receipt and acknowledgement, and historical trend log data. EcoStruxure Web Services requires user name and password to log on to the system.

MQTT IoT protocol support

The Enterprise Server and automation servers support MQTT as an option for publishing information to other systems. MQTT is a messaging transport protocol which has become increasingly popular in recent years. With its small footprint, light bandwidth utilization, and simplicity, it is ideal for M2M and IoT communication. Use MQTT to enable the Enterprise Server and automation servers to publish values to other systems through any MQTT broker or server, for example, Amazon, Microsoft, or IBM.

External log storage option

EcoStruxure BMS servers can be configured to automatically store all historical data, trend log data, event log and audit trail data, in a high-capacity, open, and well-proven database. If data needs to be available for longer periods of time, an external log storage can be incorporated into the EcoStruxure BMS without the need for extensive engineering work. The database supported is TimescaleDB, which is built on PostgreSQL. The capacity is limited only by the size of the selected storage media.

The data in the external log storage is available natively to the viewers built into the EcoStruxure Building Operation clients and to the built-in reporting functionality. No other software is required to access the data throughout the full retention period. The data is readily available for any analytics software that you already use, due to the open nature of PostgreSQL. Most reporting tools have native support for PostgreSQL.

The TimescaleDB extension to PostgreSQL optimizes the solution for time-stamped data and is well-suited for the EcoStruxure Building Operation historical data.

The system architecture is very flexible. All EcoStruxure BMS servers in an EcoStruxure BMS can write to and read from the same TimescaleDB database, or multiple databases can be used.

You can use the powerful Log Processor functionality for custom processing of trend data for viewing in charts, dashboards and for inclusion in reports. The Log Processor enables advanced calculations on one or multiple trend logs and point values.

Examples of advanced calculations:

  • Energy usage normalization

  • Virtual submeters and summaries

  • Calculation of Mean Kinetic Temperature

  • Unit conversions

  • Average, maximum, and mininum over custom periods

The output of the Log Processor can be saved in the database, including the External Log Storage or calculated automatically on demand.

Reporting

The EcoStruxure BMS servers provide built-in functionality for basic reporting that can deliver reports in any text format and XLSX, without any dependencies to other external software. Reports for XLSX can be enriched by using advanced functionality such as formulas, conditional formatting, charts and sparklines.

Reports can be generated on schedule, on an alarm event or other custom conditions, and you can get the output delivered via email or written to file.

Text and graphics-based programming tools

Unique to the industry, the EcoStruxure BMS servers have both Script and Function Block programming options. This flexibility helps assure that a suitable programming method can be selected for the application.

eMMC memory for data and backup

The automation server has a 4 GB eMMC memory, which is used, for example, for the application, historical data, and backup storage. Users can also manually back up or restore the automation server to a storage location on a PC or network. Through the Enterprise Server, users have the ability to perform scheduled backups of associated automation servers to network storage for even greater levels of protection.

IT friendly

The EcoStruxure BMS servers communicate using the networking standards. This makes installations easy, management simple, and transactions more secure.

TLS support

Communication between clients and the EcoStruxure BMS servers can be encrypted using Transport Layer Security (TLS 1.2). The servers are delivered with a default self-signed certificate. Commercial Certification Authority (CA) server certificates are supported to lower the risk of malicious information technology attacks. Use of encrypted communication can be enforced for both WorkStation and WebStation access.

Supported protocols
  • IP addressing

  • TCP communications

  • DHCP for easy network configuration

  • DNS for simple lookup of addresses

  • HTTP/HTTPS for Internet access through firewalls, which enables remote monitoring and control

  • NTP (Network Time Protocol) for time synchronization throughout the system

  • SMTP or SMTPS with support for SSL/TLS based authentication, enables sending email messages triggered by schedule or alarm

  • SNMP enables network supervision and reception of application alarms in designated network management tools

Simple DIN-rail installation

Fasteners easily snap into a locked position for panel installation. The fastener has a quick-release feature for easy DIN-rail removal.

Removable terminal blocks

AS-B servers use pluggable terminal blocks, which are easy to install and remove from the device. The terminal blocks are delivered with the device.

Efficient terminal management

The input and output terminals are clearly labeled. EcoStruxure Building Operation WorkStation can generate custom as-built labels for an AS-B server.

Protection

Protection components on the universal inputs/outputs, digital inputs, and triac outputs helps protect against high-voltage short-duration transient events. Universal inputs/outputs configured as current inputs (Ub only) have protection against over current. Universal inputs/outputs configured as voltage outputs have current limits to help protect against permanent short-circuit to ground.

SpaceLogic Operator Display support

SpaceLogic Operator Display is an easy HMI based on the BACnet B-OD profile. It can interface and interact with automation servers in a small BMS that require a simple HMI. It features a large 7-inch color touch screen and a preloaded application. It is easy to install and use and does not require any programming. Built for the equipment room, the panel-mounted SpaceLogic Operator Display offers an ingress protection rating of IP65, which makes it both dust-tight and protected from low-pressure water jets. For more information, see the SpaceLogic Operator Display Specification Sheet.

Specifications
AC input
Nominal voltage
24 VAC
Operating voltage range
+/- 20 %
Frequency
50/60 Hz
Maximum current
0.5 A rms
Recommended transformer rating
≥15 VA
DC input
Nominal voltage
24 to 30 VDC
Operating voltage range
21 to 33 VDC
Maximum power consumption
10 W
Environment
Ambient temperature, operating
0 to 50 °C (32 to 122 °F)
Ambient temperature, storage
-20 to +70 °C (-4 to +158 °F)
Maximum humidity
95 % RH non-condensing
Material
Plastic flame rating
UL94-5VB
Enclosure
PC/ABS
Ingress protection rating
IP 20
Mechanical
Dimensions
198 W x 110 H x 64 D mm (7.8 W x 4.3 H x 2.5 D in.)
Weight, including terminal blocks
0.504 kg (1.111 lb) a
a) The weight includes the display and keys, which are 0.022 kg (0.049 lb).
Weight, excluding terminal blocks
0.420 kg (0.926 lb) a
a) The weight includes the display and keys, which are 0.022 kg (0.049 lb).
Agency compliances
Emission
RCM; BS/EN 61000-6-3; BS/EN 50491-5-2; FCC Part 15, Sub-part B, Class B
Immunity
BS/EN 61000-6-2; BS/EN 50491-5-3
Safety standards
BS/EN 60730-1; BS/EN 60730-2-11; BS/EN 50491-3; UL 916 C-UL US Listed
Product
BS/EN 50491-1
Real-time clock
Accuracy in runtime mode
NTP server
Accuracy in backup mode, at 25 °C (77 °F)
+/-52 seconds per month
Backup time, at 25 °C (77 °F)
10 days
Communication ports
Ethernet
Dual 10/100BASE-TX (RJ45)
USB
1 USB 2.0 device port (mini-B)
  
1 USB 2.0 host port (type-A), 5 VDC, 2.5 W
RS-485
2-wire port, bias 5.0 VDC
Communications
BACnet
BACnet/IP, port configurable, default 47808
BACnet profile
BACnet Building Controller (B-BC), AMEV AS-B
BACnet certification
BTL Certification (BTL Listing a , WSPCert)
a) See the BTL Product Catalog for up-to-date details on BTL listed firmware revisions on BACnet International'shomepage.
Modbus
Modbus TCP, client and server
  
Serial, RS-485, master or slave
TCP
Binary, port fixed, 4444
HTTP
Non-binary, port configurable, default 80
HTTPS
Encrypted supporting TLS 1.2, 1.1, and 1.0, port configurable default 443
SMTP
Email sending, port configurable, default 25
SMTPS
Email sending, port configurable, default 587
SNMP
version 3
  
Network supervision using poll and trap
  
Application alarm distribution using trap
CPU
Frequency
333 MHz
Type
SPEAr320S, ARM926 core
DDR2 SDRAM
256 MB
eMMC memory
4 GB
Memory backup
Yes, battery-free, no maintenance
Display
Display resolution
128 x 64 pixels
Display size
36 W x 17 H mm (1.4 W x 0.7 H in.)
Display type
FSTN monochrome LCD, white color transflective backlight
Part numbers
SpaceLogic AS-B-24
SXWASB24X10001
SpaceLogic AS-B-24H
Includes display
SXWASB24H10001
SpaceLogic AS-B-36
SXWASB36X10001
SpaceLogic AS-B-36H
Includes display
SXWASB36H10001
AS-B connector kit (includes terminal blocks)
SXWASBCON10001
AS-B installer kit
SXWASBINS10001
Add-on options
SW-EWS-1, EcoStruxure Web Services (run-time) option
Consume only for one automation server
SXWSWEWSXX0001
SW-EWS-2, EcoStruxure Web Services (run-time) option
Serve & Consume for one automation server
SXWSWEWSXX0002
SW-EWS-3, EcoStruxure Web Services (run-time) option
Serve & Consume, plus Historical trend log data for one automation server
SXWSWEWSXX0003
SW-GWS-1, Web Services (Generic Consume) option
For one automation server
SXWSWGWSXX0001
SW-SNMP-1, Alarm notifications via SNMP option
For one automation server
SXWSWSNMPX0001
SW-SMART-CONNECT, Smart Connector deployment license
For one Smart Connector deployment
SXWSWSCDL100001
SW-ASDBTS-1, TimescaleDB connection option
For one automation server
SXWSWASDBXS001
SW-ASMQTT-1, MQTT publish option
For one automation server (not required if the parent Enterprise Server has a license)
SXWSWMQTTXRW01
Software requirements
External log storage option
TimescaleDB 1.2 and later
  
PostgreSQL version compatible with the TimescaleDB version
Quality assurance testing has been performed by Schneider Electric with TimescaleDB and PostgreSQL installed natively in Windows 10, Windows Server 2012, 2016, and 2019. Other deployment scenarios have not been tested by Schneider Electric.
Universal inputs/outputs, Ua and Ub
Channels, AS-B servers with 24 I/O points
12 Ua, Ua1 to Ua12
  
4 Ub, Ub1 to Ub4
Channels, AS-B servers with 36 I/O points
20 Ua, Ua1 to Ua20,
  
8 Ub, Ub1 to Ub8
Absolute maximum ratings
-0.5 to +24 VDC
A/D converter resolution
16 bits
Digital inputs
Range
Dry contact switch closure or open collector/open drain, 24 VDC, typical wetting current 2.4 mA
Minimum pulse width
120 ms
Counter inputs
Range
Dry contact switch closure or open collector/open drain, 24 VDC, typical wetting current 2.4 mA
Minimum pulse width
20 ms
Maximum frequency
25 Hz
Supervised inputs
5 V circuit, 1 or 2 resistors
Monitored switch combinations
Series only, parallel only, and series and parallel
Resistor range
1 to 10 kohm
For a 2-resistor configuration, each resistor must have the same value +/- 5 %
Voltage inputs
Range
0 to 10 VDC
Accuracy
+/-(7 mV + 0.2 % of reading)
Resolution
0.5 mV
Impedance
100 kohm
Current inputs
Range
0 to 20 mA
Accuracy
+/-(0.01 mA + 0.4 % of reading)
Resolution
1 μA
Impedance
47 ohm
Resistive inputs
10 ohm to 10 kohm accuracy
+/-(7 + 4 x 10 -3 x R) ohm
R = Resistance in ohm
10 kohm to 60 kohm accuracy
+/-(4 x 10 -3 x R + 7 x 10 -8 x R 2 ) ohm
R = Resistance in ohm
Temperature inputs (thermistors)
Range
-50 to +150 °C (-58 to +302 °F)
Supported thermistors
Honeywell
20 kohm
Type I (Continuum)
10 kohm
Type II (I/NET)
10 kohm
Type III (Satchwell)
10 kohm
Type IV (FD)
10 kohm
Type V (FD w/ 11k shunt)
Linearized 10 kohm
Satchwell D?T
Linearized 10 kohm
Johnson Controls
2.2 kohm
Xenta
1.8 kohm
Balco
1 kohm
Measurement accuracy
20 kohm
-50 to -30 °C: +/-1.5 °C (-58 to -22 °F: +/-2.7 °F)
  
-30 to 0 °C: +/-0.5 °C (-22 to +32 °F: +/-0.9 °F)
  
0 to 100 °C: +/-0.2 °C (32 to 212 °F: +/-0.4 °F)
  
100 to 150 °C: +/-0.5 °C (212 to 302 °F: +/-0.9 °F)
10 kohm, 2.2 kohm, and 1.8 kohm
-50 to -30 °C: +/-0.75 °C (-58 to -22 °F: +/-1.35 °F)
  
-30 to +100 °C: +/-0.2 °C (-22 to +212 °F: +/-0.4 °F)
  
100 to 150 °C: +/-0.5 °C (212 to 302 °F: +/-0.9 °F)
Linearized 10 kohm
-50 to -30 °C: +/-2.0 °C (-58 to -22 °F: +/-3.6 °F)
  
-30 to 0 °C: +/-0.75 °C (-22 to +32 °F: +/-1.35 °F)
  
0 to 100 °C: +/-0.2 °C (32 to 212 °F: +/-0.4 °F)
  
100 to 150 °C: +/-0.5 °C (212 to 302 °F: +/-0.9 °F)
1 kohm
-50 to +150 °C: +/-1.0 °C (-58 to +302° F: +/-1.8 °F)
RTD temperature
Supported RTDs
Pt1000, Ni1000, LG-Ni1000, and JCI-Ni1000
Pt1000
Range
-50 to +150 °C (-58 to +302 °F)
Measurement accuracy
-50 to +70 °C: +/-0.5 °C (-58 to +158 °F: +/-0.9 °F)
  
70 to 150 °C: +/-0.7 °C (158 to 302 °F: +/-1.3 °F)
Ni1000
Range
-50 to +150 °C (-58 to +302 °F)
Measurement accuracy
+/-0.5 °C (+/-0.9 °F)
LG-Ni1000
Range
-50 to +150 °C (-58 to +302 °F)
Measurement accuracy
+/-0.5 °C (+/-0.9 °F)
JCI-Ni1000
Range
-50 to +150 °C (-58 to +302 °F)
Measurement accuracy
+/- 0.5 °C (+/- 0.9 °F)
RTD temperature wiring
Maximum wire resistance
20 ohm/wire (40 ohm total)
Maximum wire capacitance
60 nF
The wire resistance and capacitance typically corresponds to a 200 m wire.
RTD resistive
1,000 ohm
Range
500 to 2,200 ohm
  
Including wiring resistance
Measurement accuracy
+/-(0.2 + 1.5 x 10 -3 x R) ohm
R = resistance in ohm
Resolution
0.1 ohm
RTD resistive wiring
Maximum wire capacitance
60 nF
Voltage outputs
Range
0 to 10 VDC
Accuracy
+/-60 mV
Resolution
10 mV
Minimum load resistance
5 kohm
Load range
-1 to +2 mA
Digital inputs, DI
Channels, AS-B servers with 24 I/O points
4, DI1 to DI4
Channels, AS-B servers with 36 I/O points
0
Absolute maximum ratings
-0.5 to +24 VDC
Digital inputs
Range
Dry contact switch closure or open collector/open drain, 24 VDC, typical wetting current 2.4 mA
Minimum pulse width
120 ms
Counter inputs
Range
Dry contact switch closure or open collector/open drain, 24 VDC, typical wetting current 2.4 mA
Minimum pulse width
20 ms
Maximum frequency
25 Hz
Relay outputs, DO
Channels, AS-B servers with 24 I/O points
4, DO1 to DO4
Channels, AS-B servers with 36 I/O points
4, DO1 to DO4
Contact rating
250 VAC/30 VDC, 2 A, Pilot Duty (C300)
Switch type
Form A Relay
  
Single Pole Single Throw
  
Normally Open
Isolation contact to system ground
3000 VAC
Cycle life (Resistive load)
At least 100,000 cycles
Minimum pulse width
100 ms
Triac outputs, DO
Channels, AS-B servers with 24 I/O points
0
Channels, AS-B servers with 36 I/O points
4, DO5 to DO8
Output rating
Max. 0.8 A
Voltage
24 VAC +/-20 %
Commons
COM1 for DO5 and DO6
  
COM2 for DO7 and DO8
The common terminals COM1 and COM2 can be connected to 24 VAC or to ground.
Common voltage, high side output
24 VAC
Common voltage, low side output
0 VAC (ground)
Minimum pulse width
100 ms

Terminals

 AS-B server model with 24 I/O points

AS-B server model with 24 I/O points

 AS-B server model with 36 I/O points

AS-B server model with 36 I/O points

For protection from excess current that could be produced by field wiring, follow these instructions:

  • Connect RET terminal number 4 or 5 to a common chassis/signal ground rail in the control panel using a size 2.5 mm² (13 AWG) or larger wire. The wire must have a current rating greater than or equal to 16 A.

  • AS-B servers with 24 I/O points have more RET terminals for connection of I/O returns, so the common chassis/signal ground rail is optional and may not be needed.

  • Individual 24 VDC power sources to the field must be current limited to maximum 4 A for UL compliant installations, and maximum 6 A in other areas.

For more information on wiring, see the SpaceLogic Hardware Reference Guide.

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