Emerson ROC827 - Analog Output (AO) Modules

ROC800-Series Instruction Manual
Revised July-2017 Input/Output Modules 4-9
On the AI-16 module, you use jumper J3 to configure the AI (+T) as 12
or 24 Volts dc. Additionally, two DIP switches on the module allow you
to select between current and voltage loop input.
A
I indicates current loop input; V indicates voltage
loop input
Figure 4-6. AI-16 DIP Switches
Caution
You can induce ground loops by tying commons from various modules
together.
4.4 Analog Output (AO) 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 ROC800 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 W38199) labeled AO-16 are an earlier
version that controls the low side current. AO modules (Part
W38269) labeled AO are a newer version (January 2005 and
later) that provides and controls the high side current.
The AO module includes a moveable jumper (see Figure 4-7). Set the
jumper to 12V if the transmitter load is 300Ω or less. Set the jumper to
24V if the transmitter load exceeds 300Ω.
A