Delta RMC101 - Manual (Page 453)

Modbus Plus 5.3
Communications 5-203
400114 0300 (hex): The high byte holds the Quantum
backplane slot ID (3). The low byte holds the Map
Index, which should be set to zero when
communicating with the RMC.
400115 192 (decimal): Routing 2: First byte of the IP
address: 192.168.0.5
400116 168 (decimal): Routing 3: Second byte of the IP
address: 192.168.0.5
400117 0 (decimal): Routing 4: Third byte of the IP
address: 192.168.0.5
400118 5 (decimal): Routing 5: Fourth byte of the IP
address: 192.168.0.5
5.3.7.4 MSTR Block Read Global Data Operation
For general information on the MSTR Block, see Using the MSTR Modicon Ladder Logic Block.
Note: This operation is only available for Modbus Plus and not Modbus/TCP.
This operation reads in Global Data registers from a particular slave device (such as the RMC).
The read always begins with the first Global Data register on the device, but the number of
registers read is set in the control block. For details on Global Data, see Using Modbus Plus
Global Data.
Note: This operation will fail with an error code of 200B if Peer Cop is used. The two methods of
accessing Global Data cannot be used at the same time.
Control Block
In a Read Global Data operation, the nine control-block registers are assigned as shown:
Register Content
1st Operation : 6
2nd Error Status : This register is filled by the
operation. See MSTR Block Error Codes for a
complete list.
3rd Length : Indicates the number of global data
registers to read.
4th Operation-dependent Value : Gets filled by the PLC with
the number of registers of global data available from
the slave.
5th Routing 1 : Address of the node to read global data from.