Automation Servers
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1546 Topic(s)
Concept
This section provides recommendations on minimum wire sizes (cross-sectional areas) and maximum wire lengths for the wires connected to the screw terminals of Central IO modules, AS-B servers, RP and MP controllers, and IP-IO and RP-IO I/O modules. Recommendations on minimum wire size and maximum cable length for the digital inputs of the RP controller expansion modules, the DALI bus of the DALI light modules, the SMI Interface of the SMI blind modules, the Zigbee DALI and 0-10V modules, and the KNX Modbus gateway are also provided. The recommendations are for guidance only. Other wire sizes and lengths may be used, depending on wiring rules and when appropriate.
How to
You install a terminal base on a horizontal DIN-rail prior to connecting it to its neighboring terminal bases.
Concept
The devices are designed mainly for installing on DIN rails in a cabinet.
Concept
The AS-B servers are designed for installation on DIN rails in a cabinet.
Concept
The recommendations include two different configuration options to choose from with differences in performance and/or resources required.
Concept
Dual end-point bias applies a separate 5 V DC supply at each end of the network to generate the RS-485 bias. Instead of a single pair of 510 ohm resistors, the dual end scheme uses a pair of 1000 ohm resistors at each end. The dual end-point is the best technique for avoiding the drop in the bias voltage over extended cable lengths as you move away from the bias connection location. By applying bias at the two termination points, the arrangement maintains an equal bias across the complete length of the cable.
Concept
This configuration is the simplest to arrange and supports bus lengths out to 150 m (500 ft) on 24 AWG (0.20 mm²). The automation server should be configured with two 510 ohm bias resistors. One resistor connecting the + data line to the Bias+ terminal on the automation server and the other resistor connecting the – data line to the RET terminal on the automation server. The bias is required to support the transceivers in the VT/VZ nodes and the termination of the bus. AS-P servers and AS-B servers provide 5 V for bias, which supports 120 ohm termination resistors at the two ends of the bus. This will achieve the minimum idle line bias voltage of +200 mV required by the transceivers. Low resistance bias configurations (with 5 V supplies) add significant common mode load on the RS-485 network. The common mode load (Unit Load) of the bias network must be summed with the accumulated unit load of the collection of VT/VZ thermostats/controllers to identify the total unit load on the bus.
Concept
This application note provides recommendations and guidelines for the configuration of RS-485 communications between the automation server and Viconics room controllers. The recommendations are associated with the Viconics VT/VZ/SE 7xxx series thermostats / room controllers configured with the Viconics plug-on MS/TP network adapter. This information is intended to supplement the instructions you receive with the various RS-485 network devices. The guidelines focus on the arrangement of the electrical interface to the automation server's RS-485 port in regards to biasing, termination, cable selection, cable lengths, and cable routing. The guidelines on maximum unit load (node count) and common mode voltage tolerance are associated with AS-P and AS-B servers.
Concept
The information in this section provides recommendations for the RS-485 interface port configuration between the automation server and RS-485 network devices. This information is intended to supplement existing guides for the automation server and for the various RS-485 network devices.
Concept
This configuration applies to the situation where existing MNB devices with bias capability (MNB-300 or MNB-1000) are not available on the network segment, and it is preferred not to add external supplies.