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Operating manual ZX09/20/21-Series
5.5.1 Digital Inputs
The ZX09 and ZX09A controllers provide ten digital inputs and the
ZX09B/C/D/E controllers two. These are accessible via the connection terminals
"Digital Input 01..10" or "Digital Input 01..02".
The ZX20T, ZX20TP and ZX20TC and ZX21T, ZX21TP and ZX21TC have 20 digital
inputs. These are accessible via the lower terminal blocks "Digital Input 01..20".
The digital inputs are not galvanically isolated from the supply voltage, i.e. their 0 V
reference potential is identical to the 0 V potential of the supply voltage (terminal M).
For generating the input signals, a different voltage source than the operating voltage
source can be used. If this is the case, the 0 V potential of this voltage source must
be connected to the 0 V potential of the operating voltage with the lowest
possible resistance. A SELV/PELV voltage source according to IEC 61558-2-6
with limitation of the output voltage in case of a fault must be used.
