Example - WAGO 750-404 Manual

30 • 750-404/000-001 [Up Counter / Enable Input]

Example

With the control and status byte the following tasks are possible:
Set Counter:
Put Bit 5 into the control byte. The counter with the 32 bit value is loaded into
output bytes 0-3. As long as the bits are set, the counter can stop and
information is stored. The ensuing data of the counter will be conveyed to the
status byte.
Lock Counter:
Bit 4 is set into the control byte, then the count process is suppressed. Bit 4 in
the status byte communicates the suppression of the counter.
Set Outputs:
Bits 2 and 3 set the additional two outputs of the counter module.
2.1.3.7 Example
Set Counter:
First of all the counter reading is set to 100 by "Setting counter", i. e. to the
hexadecimal value: 0x64.
8. Enter the set value in the output data.
Output data
Value
9. Validate the counter reading in the control byte with bit 5 (setting counter)
Output bit
Value
10.Wait for the feedback from the counter module in the status byte, bit 5
Input bit
Value
11.Delete bit 5 (setting counter) in the control byte in order to finish the
Output bit
Value
12.The set counter reading then appears in the input data with the following
Input bit
Value
X is used if a value is not relevant.
The data bytes D0 to D3 of the output data then read as follows:
to have it adopted as an output value. The control byte has the following
bits:
B7
0
(counter set). The status byte has the following bits:
B7
X
Handshake. The bits in the control byte read as follows:
B7
0
data bytes D0 to D3:
Data bytes
D3 D2
0x00 0x00
Control byte
B6 B5 B4
X 1 X
Status byte
B6 B5 B4
X 1 X
Control byte
B6 B5 B4
X 0 X
Data bytes
D3 D2
0x00 0x00
D1 D0
0x00 0x64
B3 B2 B1
X X X
B3 B2 B1
X X X
B3 B2 B1
X X X
D1 D0
0x00 0x64
WAGO-I/O-SYSTEM 750
I/O Modules
B0
X
B0
X
B0
X