Process Image - WAGO 750-404 Manual

2.1.3.6 Process Image

Using the I/O module 750-404/000-001, a 5 byte input and output process
image can be transferred to the fieldbus coupler / controller via two logical
channels.
The transfer of the setting counter value in binary format is made via 4 output
bytes (D0 ... D3) and the transfer of the counter reading in binary format is
made via 4 input bytes (D0 ... D3). The control byte C0 serves for setting and
locking the counter and for setting the outputs. The status byte S0 shows the
status of the counter and the inputs and outputs.
Attention
The representation of the process data of some I/O modules or their variations
in the process image depends on the fieldbus coupler/-controller used. Please
take this information as well as the particular design of the respective
control/status bytes from the section "Fieldbus Specific Design of the Process
Data" included in the description concerning the process image of the
corresponding coupler/controller.
S0
D0
D1
D2
D3
0
X
WAGO-I/O-SYSTEM 750
I/O Modules
Input data
Status byte 0
Counter value byte 0 (LSB)
Counter value byte 1
Counter value byte 2
Counter value byte 3 (MSB)
B7 B6 B5
0 0 Set
counter
This constant must be set to zero.
B7 B6 B5
X X Counter
is set
This value is not evaluated.
750-404/000-001 [Up Counter / Enable Input]
Output data
C0 Control byte 0
D0 Set value byte 0 (LSB)
D1 Set value byte 1
D2 Set value byte 2
D3 Set value byte 3 (MSB)
Control byte
B4 B3
Lock Set
counter output
DO 2
Status byte 0
B4 B3
Counter actual
is signal at
blocked output
DO 2
Process Image
B2 B1
Set 0
output
DO 1
B2 B1
actual actual actual
signal at signal at signal at
output input
DO 1 U/D CLOCK
• 29
B0
0
B0
input