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

ROC827 Instruction Manual

The left side of Figure 4-8 displays the internal circuitry while the right side displays possible 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.

+V

6.6KW

DI

1

2

3

4

5

6

7

8

MO

C

8 CHAN

+	DRY CONTACT
-
	ROC800 POWERED

	OPEN COLLECTOR
+	OR
-	OPEN DRAIN TYPE DEVICE
	EXTERNALLY POWERED

DOC0507A

Figure 4-8. Discrete Input Module Field Wiring

4.6Discrete Output Modules

The five-channel Discrete Output (DO) module provides two-state outputs to energize solid-state relays and power small electrical loads. These are solid-state relays. A Discrete Output may be set to send a pulse to a specified device. Discrete Outputs are high and low outputs used to turn equipment on and off.

DO modules can be software-configured as latched, toggled, momentary, or Timed Duration Outputs (TDO). The DO can be configured to either retain the last value on reset or use a user-specified fail-safe value.

The DO module provides LEDs that light when each output is active.

When a request is made to change the state of a DO, the request is immediately sent to the DO module. There is no scan time associated with a DO. Under normal operating conditions, the DO channel registers the change within 2 milliseconds.

If the DO is in momentary or toggle mode, you can enter a minimum time- on of 4 milliseconds.

Figure 4-9 displays the field wiring connections to the output circuit of the DO module.

Issued Mar-06 Input/Output Modules 4-10