HB-37420-810-01-25F-EN SMX100 Installation manual.docx Page 189 of 260
Version: 25F
5.9 Connection of digital inputs
The modules of SMX100 systems have over 14 (SMX100-1/100-2/100-4 und SMX111,
SMX111-2, SMX112, SMX112-2, SMX132) and 12 (SMX121, SMX121-2, SMX122, SMX122-2,
SMX131) safe digital inputs. These are suitable for connecting single or two-channel signals
with and without cycling, or without cross-shorting test.
The connected signals 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, Type1 acc. to IEC 61131-2). The inputs are provided with
internal input filters.
A device internal diagnostic function cyclically tests the correct function of the inputs including
the input filters. A detected fault will set the SMX100 into an alarm status. At the same time all
outputs of the SMX100 are rendered passive.
Besides the actual signal inputs, the SMX100- module holds two clock inputs T1 and T2
available. The clock outputs are switching-type 24 VDC outputs.
The clock outputs are solely intended for monitoring the digital inputs (I01 ... I14) and cannot be
used for any other function within the application.
The switching frequency is 125 Hz for each output. In the planning stage one must bear in mind
that the outputs may only be loaded with a total current of max. 250 mA.
Furthermore, approved OSSD-outputs can be connected to the inputs I01-I14 without limitation.
In case of single-channel use of the inputs, the achievable safety level must be limited to SIL 2
or PL d, if the safety function is demanded at regular intervals.
A safety related use of the inputs is generally only intended in connection with the pulse
outputs.
If pulse outputs are not used, short circuits in the external wiring between different inputs and
against the supply voltage for the SMX100 must be ruled out by external measures, appropriate
routing of cables in particular.
Each input of the SMX100 module can be configured individually for the following signal
sources:
Intput is assigned to the cycle T1
Intput is assigned to the cycle T2
Input assigned to continuous voltage DC 24 V
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