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I/O Modules
Process Data Architecture for MODBUS/TCP
• 145
750-634
The above Incremental Encoder Interface module has 5 bytes of input data (6
bytes in cycle duration measurement mode) and 3 bytes of output data. The
following tables illustrate the Input and Output Process Image, which has 4
words mapped into each image. Word alignment is applied.
Input Process Image
Offset
Byte Destination
High Byte
Low Byte
0
-
S
1
D1
D0
2
-
(D2)*)
3
D4
D3
Remark
not used
Status byte
Counter word
not used
(Periodic time)
Latch word
)
* If cycle duration measurement mode is enabled in the control byte, the cycle
duration is given as a 24-bit value that is stored in D2 together with D3/D4.
Output Process Image
Offset
Byte Destination
High Byte
Low Byte
0
-
C
1
D1
D0
2
-
-
3
-
-
Remark
not used
Control byte
Counter Setting word
not used
750-637
The above Incremental Encoder Interface Module has a total of 6 bytes of user
data in both the Input and Output Process Image (4 bytes of encoder data and
2 bytes of control/status). The following table illustrates the Input and Output
Process Image, which have 4 words mapped into each image. Word alignment
is applied.
Input and Output Process Image
Offset
WAGO-I/O-SYSTEM 750
ETHERNET TCP/IP
Byte Destination
Remark
High Byte
Low Byte
0
-
C0/S0
Control/Status byte of Channel 1
1
D1
D0
Data Value of Channel 1
2
-
C1/S1
Control/Status byte of Channel 2
3
D3
D2
Data Value of Channel 2