Emerson ROC827 instruction manual Wiring I/O Modules, Analog Input Modules

ROC827 Instruction Manual

6.Replace the wire channel cover.

4.2.3Wiring I/O Modules

All modules have removable terminal blocks for convenient wiring and servicing. The terminal blocks can accommodate a wide range of wire gauges (12 AWG or smaller).

Caution	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 ROC827 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 AWG or smaller wire.

4.3Analog Input Modules

The four Analog Input (AI) channels are scalable, but typically measure either:

ƒ4- to 20-mA analog signal, with the use of a precision resistor (supplied).

ƒ1 to 5 Volts dc signal.

If required, you can calibrate the low end of the analog signal to zero.

You can configure the AI (+T) module as either 12 or 24 Volt dc using jumper J4 on the I/O module (see Figure 4-4). The AI modules can provide isolated +12 Volt dc or +24 Volt dc field transmitter power on a per-module basis. For example, one module can provide +12 Volts dc for powering low power analog transmitters, while another module in the same ROC827 can provide +24 Volts dc for powering conventional 4- to

20-mA transmitters. Refer to Figure 4-5:

Issued Mar-06 Input/Output Modules 4-6