I/O Modules
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Process Data Architecture for MODBUS/TCP
WAGO-I/O-SYSTEM 750
ETHERNET TCP/IP
The following section describes the process image for various
WAGO-I/O-SYSTEM 750 and 753 I/O modules when using a
coupler/controller with MODBUS/TCP.
Note
Depending on the specific position of an I/O module in the fieldbus node,
the process data of all previous byte or bit-oriented modules must be
taken into account to determine its location in the process data map.
For the PFC process image of the programmable fieldbus controller is the the
structure of the process data mapping identical.
5.2.1 Digital Input Modules
Digital input modules supply one bit of data per channel to specify the signal
state for the corresponding channel. These bits are mapped into the Input
Process Image.
When analog input modules are also present in the node, the digital data is
always appended after the analog data in the Input Process Image, grouped
into bytes.
Some digital modules have an additional diagnostic bit per channel in the
Input Process Image. The diagnostic bit is used for detecting faults that occur
(e.g., wire breaks and/or short circuits).
1 Channel Digital Input Module with Diagnostics
750-435
Input Process Image
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Diagnostic
bit
S 1
Data bit
DI 1
Содержание 750-341
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