Installation Manual for SMX Modules - OEM Automatic AB

Installation Manual
4.6 Connection of digital inputs DI1 to DI14
The SMX has 14 secure digital inputs These are suitable for connecting single or twochannel
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, type 1 acc. to EN61131-2). 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 SMX into an alarm status. At the same
time all outputs of the SMX are rendered passive.
Besides the actual signal inputs DI1 to DI14 the SMX module holds two clock inputs P1 and
P2 available. The clock outputs are switching-type 24 VDC outputs.
The clock outputs are solely intended for monitoring the digital inputs (DI1 ... DI14) 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 DI1-DI4 and DI9-DI14
without limitation
Note:
Digital inputs DI5 to DI8 are not suitable for OSSDs, because there is no compliance
with EN 61131-2 Type 2 requirements.
Short circuits in the external wiring between different inputs and against the supply voltage
for the SMX must be ruled out by external measures, appropriate routing of cables in
particular.
Each input of the SMX module can be configured individually for the following signal
sources:
Input assigned to pulse P1
Input assigned to pulse P2
Input assigned to continuous voltage DC 24 V
The internal structure of the SMX-series corresponds with category 4 of EN 13849-1 with
respect to architecture and function. Each input has the following internal architecture:
HB-37350-810-01-10E-EN SMX installation manual.doc Page 19 of 19