HB-37350-810-01-50F-EN PSC1-C-10 Installation manual V2.1.docx Page 120 of 189
Version: 50F
5.10 Connection of the digital inputs
The PSC1 has 14 (PSC1-C-10(-SDMX)(-FBx) and PSC1-E-37) or 12 (PSC1-E-31/33)
safe digital inputs. These are suitable for the connection of single or dual-channel
signals with and without test pulses, or without cross-circuit testing.
The signals connected must have a "high" level of DC 24 V (DC +15 V...+ DC 30 V)
and a "low" level of (DC -3 V... DC +5 V, type 1 according to EN61131-2). The inputs
are equipped internally with input filters.
The device-internal diagnostic function cyclically checks the correct function of the
inputs including the input filter. The detection of a fault places the PSC1 in the alarm
state. At the same time all outputs on the PSC1 are rendered passive.
Along with the actual signal inputs, the PSC1 module provides two pulse outputs T0
and T1. The pulse outputs are switching 24 VDC outputs.
The pulse outputs are only intended to be used for monitoring the digital inputs (I0 ...
I13) and cannot be used for any other functions in the application.
The switching frequency is 125 Hz for each pulse output. During planning it is to be
noted that the pulse outputs are allowed to be loaded with a maximum total current of
250 mA.
In addition, approved OSSD outputs can be connected to the inputs I00-I13 without
restriction.
On the single-channel usage of the inputs, the safety level that can be achieved is
limited to SIL 2 or PL d, if there is no demand for the safety function at regular
intervals.
In principle, safety-related usage of the inputs is only intended in conjunction with the
pulse outputs.
If the pulse outputs are not used, a short-circuit in the external wiring between different
inputs and the supply voltage for the PSC1 must be excluded by means of suitable
external measures, in particular suitable cable routing.
Each input on the PSC1 module can be configured individually for the following signal
sources:
Input is assigned pulse T0
Input is assigned pulse T1
Input is assigned DC 24 V continuous voltage
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