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