Rockwell Automation 1746-HSCE High-Speed Counter Module Installation Instructions - Manual (Page 12)

12 High-Speed Counter Module
Publication 1746-IN011C-EN-P - April 2005
Important Wiring Considerations
Use the following guidelines when planning the system wiring for the module:
• Install the SLC 500 system in a NEMA-rated enclosure.
• Disconnect power to the SLC processor and the module before wiring.
• Make sure the SLC 500 system is properly grounded.
• Group this module and low-voltage DC modules away from AC I/O or
high-voltage DC modules.
• Shielded cable is required for high-speed input signals A, B, and Z. We
recommend Belden 9503 or equivalent for lengths up to 305 m (1000 ft).
• When the LS input is driven by an electromechanical device, route the
wiring away from other inputs. In addition, JW1 should be set for the 10 ms
filter.
• When the LS input is driven by a solid-state device, use a shielded cable.
You do not have to route the cable away from other inputs.
• Shields should be grounded only at the end of the signal source end of the
cable. Ground the shield to the case of the signal source, so energy coupled
to the shield will not be delivered to signal source’s electronics.