Field Wiring Connections - Allen-Bradley 1769-HSC Installation Instructions Manual

If you feel excessive resistance, make sure that you disconnected the module from the
bus and that you removed both mounting screws (or opened the DIN latches).
It may be necessary to rock the module slightly from front to back to remove it,
TIP
or, in a panel-mounted system, to loosen the screws of adjacent modules.
6. Before installing the replacement module, be sure that the bus lever on the right-side
adjacent module is in the unlocked (fully right) position.
7. Slide the replacement module into the open slot.
8. Connect the modules together by locking (fully left) the bus levers on the replacement
module and the right-side adjacent module or end cap.
9. Replace the mounting screws (or snap the module onto the DIN rail).
10. Replace the terminal block or connect input and output wiring to the module.

Field Wiring Connections

Consider these system wiring guidelines when wiring your system.
General Guidelines
•
Disconnect power to the module before wiring. This includes sensor power and
1769 bus power.
•
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 (or the type recommended by the encoder manufacturer) 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.
•
Make sure the system is properly grounded.
Compact I/O High-speed Counter Module
Publication 1769-IN030B-EN-P - October 2010
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