7AO352.70/PL3 B & R Automation
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The B & R Automation 7AO352.70/PL3 is part of the System 2003 Controllers series and features two outputs with switch selectable channels. This unit provides a voltage output of ±10 V and a current output range of 0 to 20 mA, both with a 12-bit converter resolution. It supports IP20 protection and includes safeguards against supply wiring and short circuit faults.
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Product Description:
B & R Automation’s 7AO352.70/PL3 is an analog output module for the System 2003 Controllers series. Installed on the backplane next to the PLC processor, it converts binary control words into regulated current or voltage outputs. Those outputs drive actuators, drives, and indicating instruments that require continuous signals for closed-loop operation in industrial automation cells. This makes the module suitable for linking PLC logic with analog field devices in compact control racks.
The module uses a 12-bit digital-to-analog converter, giving 4096 discrete steps for each channel. Output ranges are switch-configurable per channel, allowing either 0 to 20 mA current or ±10 V voltage operation without additional calibration. Each of the two outputs can drive up to 400 Ω in current mode, while voltage mode is limited by a 10 mA load to keep linearity within tolerance. Protection against reversed supply wiring and short circuits is integrated, although there is no isolation between the outputs and the PLC, so common-ground planning is required. Channel selection is made through onboard DIP switches, and the IP20 housing protects the electronics once the card is latched into the System 2003 terminal rack. Overall power draw is 1.2 W, which helps limit demand on the shared backplane supply when several modules are installed.
The accuracy figures are given as gain and offset values. In current mode, the span error is ±0.06 % and the offset is ±5.3 µA. In voltage mode, the gain error is ±0.3 % and the offset is ±5.2 mV. These tolerances matter when the outputs feed field devices over longer cable runs or into circuits that share a common reference. Independent channel configuration also allows one output to serve a current-input device while the other feeds a voltage-input device. That flexibility is useful when a machine combines proportional valves, analog drives, and indicating instruments on the same controller platform.
Frequently Asked Questions about 7AO352.70/PL3:
Q: How many outputs are available on the 7AO352.70/PL3 module?
A: The 7AO352.70/PL3 provides two analog outputs.
Q: What output signal types does the 7AO352.70/PL3 support?
A: This model supports voltage outputs of ±10 V and current outputs of 0 to 20 mA.
Q: How is output selection configured on the 7AO352.70/PL3?
A: Each output channel can be individually configured using a switch on the module.
Q: What kind of protection does the 7AO352.70/PL3 analog module offer?
A: Short circuit and supply wiring protection are provided for output safety.
Q: Does the 7AO352.70/PL3 offer any isolation between outputs or between outputs and the PLC?
A: The module does not provide output-to-output or output-to-PLC isolation.
