WAGO 750-341 Manual page 56

52 • Fieldbus Coupler 750-341
Process image
4 Channel Analog Output Modules
750-551, -557, -559
Offset
3.1.4.3.5 Specialty Modules
WAGO has a host of Specialty I/O modules that perform various functions.
Most of these modules contain control and status memory, as well as input and
output data memory. These memory addresses allow for bi-directional
exchange of data between the coupler and the I/O module. With this
architecture, it is possible to preset a counter value by means of a control byte
or use a status byte to detect a undershoot or overshoot condition. When a
specialty module has a control/status byte, it is always the low byte of a word.
Further information
For detailed information about the structure of a particular module's
control/status byte, please refer to that module's manual. Manuals for each
module can be found on the Internet under:
http://www.wago.com.
Counter Modules
750-404, /000-000, /000-001, /000-002, /000-003, /000-004
The above 750-404 Counter Modules have a total of 5 bytes of user data in
both the Input and Output Process Image (4 bytes of counter data and 1 byte
of control/status). The counter value is supplied as 32 bits. The following
tables illustrate the Input and Output Process Image, which has 3 words
mapped into each image. Word alignment is applied.
Offset
Byte Destination
High Byte Low Byte
0 D1
1 D3
2 D5
3 D7
Byte Destination
High Byte Low Byte
0 -
1 D1
2 D3
Output Process Image
D0 Output Value Channel 1
D2 Output Value Channel 2
D4 Output Value Channel 3
D6 Output Value Channel 4
Input Process Image
S
D0
D2
Remark
Remark
Status byte
Counter Value
WAGO-I/O-SYSTEM 750
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