750-404 [Up/Down Counter /100 kHz] • 19
Process Image
WAGO-I/O-SYSTEM 750
I/O Modules
2.1.2.7.2 Control- / Status byte 750-404/000-002
The control byte C0 serves for starting the periodic counter pulse
measurement and for setting the outputs. The status byte S0 shows the status
of the counter and the inputs and outputs.
Control byte
B7
B6
B5
B4
B3
B2
B1
B0
0 0
Start
of
the
periodic
counting
0 Set
output
DO 2
Set
output
DO 1
0 0
0
This constant must be set to zero.
Status byte
B7
B6
B5
B4
B3
B2
B1
B0
X X
Counting
starting
X actual
signal at
output
DO 2
actual
signal at
output
DO 1
actual
signal at
input
U/D
Toggelbit
for end of
the
record
X
This value is not evaluated.
The counter begins processing with pulses at the CLOCK input and counts the
pulses in a special time span. The time span is given as 10 s.
The state of the counter is stored in the process image until the next period.
After the recording the counting starts again at 0.
The activation of the counting and the synchronization with the SPS is made
by a handshake in the control and status byte.
The end of the counting period and thus the new process data is signaled by a
toggle bit in the status byte.
