Interfaces 6
miriac EK-5744 User Manual
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© MicroSys Electronics GmbH 2017
6.5 Digital Inputs
There are four digital inputs onboard the EK-5744 operating within the voltage
range 0V-24V according to IEC61131-2 table 7. The CPU reflected state is the in-
verted state of the input signal, i.e. if an input is unpowered, a logical high state will
be read on the cpu side. All inputs are protected against wrong polarity and are
able to withstand voltages up to 100V in any direction. Each input is fully testable
during operation and has the following specifications. A valid input can only be
read by the CPU if all test features of the input are disabled.
6.5.1 Input Port Specification
Digital Input
Specification
input impedance
10-15kOhms
open input state
cpu pin high
input low state
cpu pin high
input high state
cpu pin low
input low range voltage
0-9V
input high range voltage
11-24V
input low range current
0mA-1mA
input high range current
1mA-2.5mA
100V inrush current
max.10mA
rising edge delay
>10us
falling edge delay
>15us
input resistor type
MELF
selftestable parts
all, except input resistor
input state during test
any
Table 6-7: Digital Inputs Electrial Specification
