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Concept

Concept


Products: Automation Server, AS-B, IP-IO , MP-C, MP-V, AS-P
Functionalities: Hardware
Product version: 2.0, 2.1
6/2/2022

Communication Port Wiring

arrow1_rotationRS-485 Communications arrow1_rotationLonWorks Communications arrow1_rotationUSB Connections arrow1_rotationEthernet Connections arrow1_rotationSensor Bus Connections

The wiring recommendations for the communication ports on the SmartX servers and SmartX IP Controller devices apply to wires and cables used for RS-485 communications, LonWorks communications, USB connections, Ethernet connections, and Sensor Bus connections. Always use the recommended cables and wires.

For Automation Servers, the LonWorks wiring is made to the terminal base and can be done before the electronics module is fitted. The connections for RS-485 are made to the removable terminal blocks, and the connections for Ethernet and USB are made to the electronics module.

For SmartX AS-P servers, the LonWorks wiring is made to the removable terminal blocks. The connections for RS-485 are made to the removable terminal blocks, and the connections for Ethernet and USB are made to the electronics module.

For SmartX AS-B servers, the connections for RS-485 are made to the removable terminal blocks and can be done before the SmartX AS-B server is installed on the DIN rail. The connections for Ethernet and USB are made directly to the device.

SmartX IP Controller – MP Series controllers have communication ports for Ethernet, USB, and Sensor Bus. All connections are made directly to the device.

SmartX IP Controller – IP-IO modules have communication ports for Ethernet and USB. All connections are made directly to the device.

RS-485 Communications

The information in this section provides recommendations for the RS-485 interface port configuration between the SmartX server and RS-485 network devices. This information is intended to supplement existing guides for the SmartX server and for the various RS-485 network devices.

For more information, see RS-485 Communications .

LonWorks Communications

Twisted pair cables should be used between the FTT-10 interface on the Automation Server or SmartX AS-P server terminal base and the TP/FT-10 LonWorks network. The cables should conform to the standard EN 50173-1.

USB Connections

Standard USB cables should be used for connection to the USB host and device ports on the SmartX server and SmartX IP Controller device. The recommended maximum cable length is 3 m (10 ft).

Notice

LOSS OF COMMUNICATION

Do not use a USB cable that exceeds 3 m (10 ft).

Failure to follow these instructions can result in loss of communication.

Ethernet Connections

Standard Ethernet cables with RJ45 connectors should be used for connection to the Ethernet 10/100 port(s) on the SmartX server and SmartX IP Controller device.

Notice

EQUIPMENT DAMAGE

Do not connect any type of Power over Ethernet (PoE) Power Sourcing Equipment (PSE) to the Ethernet ports.

Failure to follow these instructions can result in equipment damage.

Unshielded cables

Standard UTP Ethernet cables are recommended for the network connections.

Shielded cables

Shielded network cables can be used on cable sections extending through noisy electrical environments. However, shielded network cables cause ground loops. The grounded RJ45 network connector passes the local ground from a device to the shield of the cable, which in turn passes to the ground of the subsequent device. The devices can be SmartX servers, SmartX IP Controller devices, or third party IP controllers, interface devices, network switches or routers, or telecom switch equipment.

Shield-induced ground loops can cause the following problems:

  • Degraded performance on communications network

  • Interruption of communication-dependent process control execution

  • Unstable operation and/or restart of the two devices

  • Damage to one or both devices

Warning Warning

Unintended equipment operation

Equipment damage or loss of communication

  • Ensure adequate electrical bonding is provided between the grounds serving the two device locations to achieve and maintain equal potentials (0 V) between the two devices.

  • Confirm equal potential is maintained when equipment in both areas has power applied and actively functioning.

Failure to follow these instructions can result in equipment damage or loss of communication.

Failure to follow these instructions can result in death, serious injury, or equipment damage.

The objective is to minimize the potential problems created with ground loops in the facility. The effects and risks with ground loops are reduced when the devices are served from the same AC power distribution panel and the devices are in the same general area of the facilities' metal and grounding structure.

Sensor Bus Connections

Cat 5 (or higher) cables with eight conductors (four twisted pairs) and RJ45 connectors should be used for connection to the Sensor Bus port on the MP Series controller and the RJ45 port(s) on the SmartX Sensors. The wire size (cross-sectional area) should be 22 to 26 AWG (0.34 to 0.14 mm²). The sensor bus cables should be rated for the target environment. For example, when the MP Series controller is installed in space handling conditioned air or return air, the cables should be plenum-rated. The cables should be located away from external electrical noise sources such as high voltage cables or signal cables, which can cause data communication problems. The maximum total length of the sensor bus is 61 m (200 ft).

Notice

LOSS OF COMMUNICATION

  • Ensure that the total length of the sensor bus does not exceed 61 m (200 ft).

  • Use a Cat 5 or higher unshielded twisted pair cable with eight conductors (four twisted pairs), a cross-sectional area of 22 to 26 AWG (0.34 to 0.14 mm 2 ), and a rating that meets the requirements of the target environment.

Failure to follow these instructions can result in loss of communication.

Unshielded cables

UTP (unshielded twisted pair) cables are recommended for the sensor bus.

Shielded cables

Shielded cables are not useful to use for the sensor bus, because the RJ45 receptacles on the MP Series controllers and SmartX Sensors do not support grounding of the shield.

See Also

  • Wiring
  • Automation Servers
  • SmartX AS-P Servers
  • SmartX AS-B Servers
  • MP-Cs
  • MP-Vs
  • IP-IO Modules
  • RS-485 Communications