Concept
Communication Port Wiring
The wiring recommendations for the SmartStruxure server device communication ports apply to the wires and cables used for RS-485 communications, LonWorks communications, USB connections, and Ethernet connections. Always use the recommended cables and wires.
For Automation Server, 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 AS-P, 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 AS-B, the connections for RS-485 are made to the removable terminal blocks and can be done before AS-B is installed on the DIN rail. The connections for Ethernet and USB 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 SmartStruxure server device and RS-485 network devices. This information is intended to supplement existing guides for the SmartStruxure server device 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 AS-P 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 SmartStruxure server device. The recommended maximum cable length is 3 m (10 ft).
Ethernet Connections
Standard Ethernet cables with RJ-45 connector should be used for connection to the Ethernet 10/100 port(s) on the SmartStruxure server device, and other devices included in the SmartStruxure solution.
Standard UTP Ethernet cables are recommended for the network connections.
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 SmartStruxure server 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
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Unintended equipment operation Equipment damage or loss of communication
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.
Wiring
Automation Servers
AS-Ps
RS-485 Communications