Product Description XI/ON - Eaton Automation

XI/ON: Gateways for Modbus TCP 5 Implementation of Modbus TCP
5.7 Bit Areas: Mapping of Input-Discrete- and Coil-Areas
The digital in- and outputs can be read and written (for outputs) as
registers in the data area of the packed in- and output process data.
Note
In the packed process data, the digital I/O data are stored following
the variable in- and output data area of the intelligent modules,
which means they are stored with a variable offset, depending on
the station’s I/O-configuration.
In order to set for example a single output (single coil), the following
functions are available for reading and writing single bits::
FC1 („Read Coils“),
FC2 („Read Discrete Inputs“),
FC5 („Write Single Coil“)
FC15 („Write Multiple Coils“)
Data mapping in the input-discrete- and coil-areas:
Mapping: input-discrete-area
All digital inputs are stored in this area (offset "0").
Mapping: Coil-area
All digital outputs are stored in this area (offset "0").
80 M001973-01, 07/2007