ROC800-Series Instruction Manual
Revised July-2017 Input/Output Modules 4-7
4.2.4 Removing an I/O Module
To remove an I/O module:
1. Remove the wire channel cover.
2. Disconnect the field wiring.
3. Unscrew the two captive screws holding the module in place.
4. Gently pull the module’s lip out and remove the module from the
slot. You may need to gently wiggle the module.
5. Install a new module or install the module cover.
6. Screw the two captive screws to hold the module or cover in place.
7. Replace the wire channel cover.
4.2.5 Wiring I/O Modules
All modules have removable terminal blocks for convenient wiring and
servicing. The terminal blocks can accommodate 12 to 22 AWG for
wiring.
Failure to exercise proper electrostatic discharge precautions, such as
wearing a grounded wrist strap may reset the processor or damage
electronic components, resulting in interrupted operations.
To connect the wire to the removable block compression terminals:
1. Bare the end (¼ inch maximum) of the wire.
2. Insert the bared end into the clamp beneath the termination screw.
3. Tighten the screw.
The ROC800 should have a minimum of bare wire exposed to prevent
short circuits. Allow some slack when making connections to prevent
strain.
Note: All modules have removable terminal blocks for convenient
wiring and servicing. Twisted-pair cable is recommended for I/O
signal wiring. The removable terminal blocks accept 12 to 22
AWG wiring.
4.3 Analog Input (AI) Modules
The Analog Input (AI) modules (both AI-12 and AI-16) have four
scalable channels which typically measure either:
4–20 mA analog signal, with the use of a precision resistor
(supplied).
1–5 Volts dc signal.
If required, you can calibrate the low end of the analog signal to zero.
Refer to Chapter 7 in the ROC800-Series specific manual (part
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