Siemens SIMATIC C7-626 Installation, Assembly, Wiring page 107

Pin Assignments The pin assignments of the universal inputs are as follows:
of the Universal
Inputs
Table 7-1
Assigning
The universal inputs are set with the software. This is done using the STEP 7
Parameters to the
application Hardware Configuration. You use this application to determine
Inputs
which function the individual input is to execute (see Table 7-1).
Interrupt Input If this function is set, the input responds like a normal interrupt input, that is,
a hardware interrupt is triggered in the C7 CPU as a response to the edge
with assigned parameters.
Digital Input
If this function is set, the input responds like a normal digital input (see
Section 5.2). The only difference here is that the current process signal is not
automatically fed to the control program but must first be read in from the
I/O.
Counter Input These universal inputs enable you to capture counter pulses up to a frequency
of 10 kHz. The counter can count either up or down.
Frequency
This enables you to count pulses within a programmed length of time. From
Counter
this you can calculate a frequency
Period Duration This function enables you to count fixed timer ticks between two equal
Counter edges. From this you can calculate the duration of an interval period.
C7-626 / C7-626 DP Control Systems
C79000-G7076-C626-01
Assignments of the Universal Inputs
Pin No.
M Relevant ground
DI–X1 Universal input 1 ( interrupt input, digital input, or counter input)
DI–X2 Universal input 2 ( interrupt input, digital input, or counter input)
DI–X3 Universal input 3 (interrupt input, digital input, counter input, frequency
counter input or period duration counter input)
DI–X4 Universal input 4 ( interrupt or digital input)
Not connected
Not connected
Not connected
Universal Inputs
Function
10 kHz.
7
7-3