Rockwell Automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User Manual - Manual (Page 28)

Chapter 2
Installing the Control Coprocessor
2-10
Standalone Installation
You can place the control coprocessor in any available slot in the I/O
chassis with the following limitations:
We recommend that you configure the chassis for 1-slot addressing.
The serial expander module, when used, must reside in the same module
pair (under the same locking tab) as the main module.
If you have two control coprocessors, place them in different module
pairs. Two coprocessors cannot be placed under one locking tab.
Place 1785-BCM/BEM backup communication module(s) in a different
module pair (under a different locking tab) than the control coprocessor.
You can place the 1785-BCM module in a slot adjacent to the control
coprocessor but in a different module pair.
Place 1771 I/O modules that require expander modules in a different
module pair (under a different locking tab) than the control coprocessor.
Examples are: 1771-IX, -QC, -QA, -OF, and -IF.
To install the control coprocessor in the 1771 I/O chassis:
1. Verify that power is OFF to the 1771 I/O chassis.
2. Using the card guides, insert the control coprocessor into the
designated slot of the I/O chassis.
3. Slide the module until it fits into the chassis backplane connector.
4. Close the chassis locking tab for the module.
5. Install the serial expander module using the previous section,
Serial Expander Module Installation, beginning on page 2-9.
On the serial expander module, wire your load to the normally open (NO)
or normally closed (NC) position, as appropriate for your application.
The fault relay is activated automatically when the main module faults or a
main module is not adjacent to the serial expander module. A fault
condition occurs when the control coprocessor’s firmware cannot keep a
hardware watchdog from timing out.
The fault relay can handle a load of 500 mA at 30 Vac/dc. You can use
the fault relay for resistive loads without contact protection (to its rated
load). For capacitive, inductive, filament, or other loads that produce
surges, contact protection is recommended. Use relay manufacturer’s data
books to select contact protection devices or see the 1771 Discrete I/O
Wire the Fault Relay
(NC)
(NO)