schmersal PSC1-C-10 Series, Руководство по установке

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Installation manual
PSC1-C-10 Installation manual V2.6 Page 106 of 173
Version: 57E
5.9 Connection of the digital inputs
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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.
o
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.
o
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 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