AtlasPC Digital Control, Vol. I
Manual 85586V1
72
Woodward
Analog Outputs
The Analog outputs are 4–20 mA with a full scale range of 0–24 mA. The Analog
Combo board has four Analog outputs.
Atlas
51
52
53
+
#1
+V
4-20 mA
Output
On earlier versions of
the Analog Combo
board, the cable
shield termination
went directly to earth.
Figure 7-8. Wiring Example–Analog Output Interface
(to the Analog Combo Board)
Configuration Notes
•
Refer to Figure 7-8 for analog output wiring.
•
Only 4–20 mA signals are output.
•
See the specifications section for the maximum analog output load.
•
Care should be taken to prevent ground loops and other faults when
interfacing to non-isolated devices.
•
The output does not contain fault detection. If it is necessary to detect
failures, then the device that is driven by the Analog output, for example an
actuator driver, must contain reference failure detection.
•
The Analog outputs have a 15 V common mode voltage, with respect to
AtlasPC control common.
•
+V is 15 V
Avoid misconnection of the Analog Output (+) to the Actuator Output
(–). This will damage internal components, making the control
inoperable. This applies only when a SmartCore Board with actuators
is installed in the control.
Fault Detection (Board Hardware)
Each Analog Combo board has a red fault LED that is turned on when the
system is reset. During initialization of a board, which occurs after every CPU
reset, the CPU turns the Fault LED on. The CPU then tests the board using
diagnostic routines built into the software. If the diagnostic test is not passed, the
LED remains on or blinks. If the test is successful, the LED goes off. If the fault
LED on a board is illuminated after the diagnostics and initialization have been
completed, the Analog Combo board may be faulty or may have the address DIP
switches configured incorrectly. The DIP switch setting must match the module
address set in the GAP application program.
Summary of Contents for AtlasPC
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