Rockwell Automation 1785-RC Application Relay Interface Installation Instruction - Manual (Page 6)

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,PSRUWDQW When the relay cartridge internal relay coil switches (from
open to closed, or closed to open), you must wait at least 50ms
before acting on the internal relay contact status bit 2. The
Internal Relay Contact Status indicator may briefly flash RED
during this time.
,PSRUWDQW You must qualify relay contact status bit 2 with the relay
cartridge 120Vac external power valid bit 0 to assure correct
internal relay contact status.
,PSRUWDQW Relay contact status bit 2 is filtered by the controller’s
firmware. The firmware reads the relay contact status circuit
each program scan. Status bit 2 is updated only after two
successive reads return the same logic level of status. The
update time of status bit 2 will vary depending on program
scan time.
Bit 3 - this bit is set whenever the relay cartridge is resident in the PLC-5
controller.
How the Relay Cartridge Works
The relay cartridge is designed to open a relay contact whenever
the PLC-5 controller detects specific software operation requests, such as:
•
a ladder program edit request from RSLogix5, AI5 or 6200 series
software - this includes ladder rung inserts, deletes, modifications or
modifying processor’s name and/or program file names.
•
a change to the state of I/O forces - including changing the state of
force bits in the force table and enabling or disabling I/O forces.
,PSRUWDQW ALL I/O Force requests will be delayed for one second
before the request becomes active.
When the controller is in Run, Remote Run or Remote Test mode, and
any of the above requests are detected by the controller, it will open the
relay contact for one second.
When the controller is in Program or Remote Program mode, the relay
is returned to its normal ON or contact closed state.