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2.4.10 D20C Combination I/O Peripheral
The D20C is a combination I/O module used for small-point-count applications. The D20C is
configured with:
• 16 digital inputs and 8 momentary or dual function trip/close control outputs
• Optional 16 analog inputs
• Optional 8 analog inputs and 8 analog outputs.
D20 C1 and D20 C2 daughter boards are available as add-on options for the D20C to give
additional analog inputs and outputs, as follows:
D20C Peripheral
D20C
D20C with D20 C1 Daughter Board
D20C with D20 C2 Daughter Board
2.4.10.1 D20C I/O Processing
Depending on its configuration, the D20C carries out the input and output processing described
in the preceding sections for the D20S, D20A and D20K.
The D20C performs I/O processes similar to those performed by the other D20 I/O modules, but
at a faster clock speed, required to meet the increased processing power demand.
The same technology is used on the D20C as on the other D20 peripheral I/O modules:
• Digital inputs are the same design as the D20 S. Chatter filtering can be applied.
• Optional analog inputs/outputs are provided through plug-in daughter boards. One shield
termination is provided for every two inputs. The programmable gain feature provided on the
D20A is not supported on the D20 C. The voltage-to-frequency converter is fixed at 5 V full
scale.
• Control output security is the same as that supported by the D20K. Interposing relays can be
supplied using a D20KI. A Local/Remote switch is provided to turn off relay coil power and
put the module off-line (including analog, status and control). An off-line indication is sent to
the D20 main processor, which is available to the host as a pseudo-status.
2.4.10.2 D20C Specifications
For a more complete description on the status, analog and control features of the D20 C, refer to
the sections on the D20S, D20A and D20K modules.
GE Information
Table 15 D20C Daughter Boards
Digital
Inputs
16
8
16
8
16
8
PRPI-019-3.00-10
D20/D200 Technical Overview
Control
Analog
Outputs
Inputs
-
16
8
Analog
Outputs
-
-
8
59
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