Emerson ROC827 instruction manual Pulse Input Modules, Discrete Output Relay Module Field Wiring

ROC827 Instruction Manual

Note: The Discrete Output Relay module operates only with discrete devices having their own power source.

When a request is made to change the state of a DOR, the request is immediately sent to the DOR module. There is no scan time associated with a DOR. Under normal operating conditions, the DOR channel registers the change within 12 mSecs. If the DOR is in momentary or toggle mode, DOR channels register the change within 48 mSecs.

The DOR modules draw power for the active circuitry from the backplane.

Note: On power up or reset, the DO Relay module’s LEDs enter indeterminate state for a few seconds as the module self-identifies. The LEDs may flash, stay on, or stay off for a few seconds.

Vs

S R

CONTROL

LATCHING RELAY

NOTE: S = SET

R = RESET

Vs

S R

CONTROL

DO-
RELAY
1	+
HC
	-
2	+
HC	-
3	+
HC	-
4	+
HC	-
5	+
HC	-
	5 CHAN

DOC0509A

+DISCRETE DEVICE

- SELF- POWERED

DISCRETE DEVICE

-EXTERNALLY POWERED +

-

Figure 4-10. Discrete Output Relay Module Field Wiring

Note: All I/O modules are isolated on the field side. Be aware that you can induce ground loops by tying commons from various modules together.

4.8Pulse Input Modules

The Pulse Input (PI) module provides two channels for measuring either a low speed or high speed pulse signal. The PI module processes signals from pulse-generating devices and provides a calculated rate or an accumulated total over a configured period. Supported functions are slow- counter input, slow rate input, fast counter input, and fast rate input.

Issued Mar-06 Input/Output Modules 4-12