Pacsystems Modbus Client Endian Conversion Example - GE PACSystems RXi User Manual

Chapter 8. Gigabit Ethernet (GbE) Interface Overview and Operation
Rung #15: The COMMREQ Function has the same input parameters as in Rung 5.
The FT output (energizes the CLOSE_FLT coil in this example) is turned ON (set to 1) if
there were problems preventing the delivery of the Command Block to the Ethernet interface.
In this case, the other status indicators are not updated for this COMMREQ.
Rung #16: When ETH_READY is set the CRS word for the Close Modbus TCP Connection
COMMREQ is monitored for a status of 1, indicating that the Close COMMREQ completed
successfully. The CRS word change to 1 sets coil CLOSE_SUCCESS.
8.7.4

PACSystems Modbus Client Endian Conversion Example

The following example table shows the Endian conversion behavior for the PACSystems
Modbus Client:
Memory Memory value
Location /
Type
Client Bit %M16-%M1 =
0x4321
Server Bit %M16-%M1 =
0x4321
Client Word %R1 = 0x4321
Server Word %R1 = 0x4321
186
Transfer
example Direction
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

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PACSystems* RXi Distributed IO Controller User Manual
Memory Resulting Value After
Location / Transfer
Type
Server Word %R1 = 0x4321
Client Word %R1 = 0x4321
Server Bit %M16-%M1 = 0x4321
Client Bit %M16-%M1 = 0x4321
Notes
End-to-end bytes
unswapped
End-to-end bytes
unswapped
End-to-end bytes
unswapped
End-to-end bytes
unswapped
GFK-2816F