Rockwell Automation 1769-HSC Compact High Speed Counter Module - Manual (Page 54)

54 Rockwell Automation Publication 1769-UM006E-EN-P - July 2013
Chapter 3 Installation and Wiring
Field Wiring Connections Consider these system wiring guidelines when wiring your system.
General Guidelines
• Make sure the system is properly grounded.
• Input and output channels are isolated from the 1769 Compact bus. Input
channels are isolated from one another; output channels are not.
• Shielded cable is required for high-speed input signals A, B, and Z. Use
individually shielded, twisted-pair cable for lengths up to 300 m (1000 ft).
• Group this module and other low voltage DC modules away from AC I/O
or high voltage DC modules.
• Route field wiring away from any other wiring and as far as possible from
sources of electrical noise, such as motors, transformers, contactors, and
AC devices.
• Routing field wiring in a grounded conduit can reduce electrical noise.
• If field wiring must cross AC or power cables, make sure that they cross at
right angles.
Terminal Block Guidelines
• For optimum accuracy, limit overall cable impedance by keeping cable as
short as possible. Locate the module as close to input devices as the
application permits.
• Tighten terminal screws with care. Excessive tightening can strip a screw.
Grounding Guidelines
• This product is intended to be mounted to a well-grounded mounting
surface, such as a metal panel. Additional grounding connections from the
module’s mounting tabs or DIN rail (if used) are required only when the
mounting surface is non-conductive and cannot be grounded.
• Keep shield connection to ground as short as possible.
• Ground the shield drain wire at the 1769-HSC module, input end only.
Refer to the Industrial Automation Wiring and Grounding Guidelines,
publication
1770-4.1 , for additional installation requirements.