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ROC827 Instruction Manual
Issued Mar-06 Input/Output Modules 4-8
4.4 Analog Output Modules
The 16-bit Analog Output (AO) module has four channels that provide a
current output for powering analog devices. Analog Outputs are analog
signals the ROC827 generates to regulate equipment, such as control
valves or any device requiring analog control.
Each channel on this module provides a 4- to 20-mA current signal for
controlling analog current loop devices. The AO module isolation includes
the power supply connections.
Note: AO modules (Part Number W38199) with front labels that read AO-
16 are an earlier version that controls the low side current. AO modules
(Part Number W38269) with front labels that read AO are the newer
version (January 2005 and later) and control the high side current.
You can configure the AO module as either 12 or 24 Volts dc via jumper
J4 on the I/O module (see Figure 4-6). The AO module can provide
isolated +12 Volts dc or +24 Volts 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 4-7.
Figure 4-6. Analog Output Jumper J4 (Shown Set to +12V)
+T 12 / 24 V dc
Jumper