GE WESDAC D20A Analog Scan Module

The D20 Analog module is composed of two detachable modules, WESTERM D20 A and WESDAC D20 A.The bottom module, WESTERM D20 A, is where all field wirings are terminated. The top module, WESDAC D20 A, processes the data acquired and communicates this to the main D20 processor.

The WESTERM D20 A is the termination module for the WESDAC D20 A analog input module. All field,I/O, and power terminations for the WESDAC D20 A are made on the WESTERM D20 A. Up to 32 analog inputs can be accommodated on compression type terminations. Through the use of input adapter modules, individual inputs can be configured for voltage or current. Voltage ranges currently accepted are 1, 5 or 10 volt full scale unipolar or bipolar. Current inputs are sampled via a shunt resistor and there fore almost any common current range can be accepted. A wetting source is supplied for current loop inputs.(Hydran 201Ti、

04240FD11234A)

Capacitors and varistors are equipped to provide Surge Withstand Capability (SWC) as well as impulse protection on all field inputs. 

Loop voltage for field transducers can be provided on an individual input basis. The voltage source can be either the input to the WESDAC D20 A or an external source.

Two DB 9 connectors are provided to allow daisy chaining of the D.20 Link. This link provides the communication channel over which the main D20 CPU processor, the WESDAC D20 M, can communicate with the WESDAC D20 A. Power for the WESDAC D20 A is also provided over the same cable assembly. The power is fused and filtered by passive components on the WESTERM D20 A.

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