Siemens SIMATIC C7-626, Installation, Assembly, Wiring

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7
7-3
C7-626 / C7-626 DP Control Systems
C79000-G7076-C626-01
The pin assignments of the universal inputs are as follows:
Table 7-1 Assignments of the Universal Inputs
Pin No. Function
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
The universal inputs are set with the software. This is done using the STEP 7
application Hardware Configuration. You use this application to determine
which function the individual input is to execute (see Table 7-1).
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.
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.
These universal inputs enable you to capture counter pulses up to a frequency
of 10 kHz. The counter can count either up or down.
This enables you to count pulses within a programmed length of time. From
this you can calculate a frequency
10 kHz.
This function enables you to count fixed timer ticks between two equal
edges. From this you can calculate the duration of an interval period.
Pin Assignments
of the Universal
Inputs
Assigning
Parameters to the
Inputs
Interrupt Input
Digital Input
Counter Input
Frequency
Counter
Period Duration
Counter
Universal Inputs