Delta RMC101 User Manual
Page 446
RMC100 and RMCWin User Manual
5-196
In the second method, you must not reset the condition that triggers the MSTR block until the
block completes.
Outputs
There are three possible outputs:
• Active: This output will be ON while an operation is in progress
• Unsuccessful: The operation failed. Refer to the Error Status register described below under
Control Block for details on the failure.
• Successful: The operation completed successfully
Control Block
A 4x (holding) register is given in this field (node). This register is the first of nine contiguous
holding registers that comprise the control block:
Register
Content
1st
Operation
: There are nine operation types, but only these
four are used during normal operation and documented
here:
1: Write data (click here for details and example)
2: Read data (click here for details and example)
6: Read Global Data (Modbus Plus only) (click here for details
and example)
9: Peer Cop Health (Modbus Plus only) (click here for details and
example)
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 registers to transfer.
4th
Operation-dependent Value:
Write:
Indicates the register address in the slave to write to
Read:
Indicates the register address in the slave to read from