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Digital Inputs
About Digital Inputs
The digital inputs are used to provide the Twin with information on the
operational status and condition of pumps, valves, and other process control
devices. Based on the information supplied, by the inputs, the Twin, will
make intelligent decisions and modify its control regime to meet the demand
of the prevailing operational requirements.
The parameters used to program the Digital inputs are as follows:
Common Parameters P*300 to P*306
Digital Input 1 P*372 to 374 Digital Input 2 P*375 to 377
Digital Input 3 P*378 to 380 Digital Input 4 P*381 to 383
Digital Input 5 P*384 to 386 Digital Input 6 P*387 to 389
Digital Input 7 P*390 to 392
Common Parameters Set-up
These parameters determine specific operational criteria for particular digital
input functions and are common to each digital input.
Input Type
The digital inputs can be either voltage source, where Twin will supply the
switching voltage, or voltage synch, where the switching voltage is supplied
by the input from the device, for full details see Chapter 2 Installation.
Both voltage source and voltage synch. inputs can be configured for N.O. or
N.C. operation as determined by the digital input Type P*372, 375, 378,
381, 384, 387, 390 when set to 1= Input N.C., Twin will recognises a
closed condition, D.C. signal voltage present at input, as a healthy
condition, alternatively, an open condition, D.C. signal voltage not present
at input, indicating a healthy condition, can be chosen as a valid input by
selecting 2=Input N.O.
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