CET Electric Technology
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date or time values will be rejected by the meter. In addition, attempting to write a Time value less than
Jan 1, 2000 00:00:00 will be rejected.
Table 5-27 Time Registers
5.9 DO Control
The DO Control registers are implemented as both “Write-Only” Modbus Coil Registers (0XXXXX) and
Modbus Holding Registers (4XXXXX), which can be controlled with the Force Single Coil command
(Function Code 0x05) or the Preset Multiple Hold Registers (Function Code 0x10). The PMC-D726M does
not support the Read Coils command (Function Code 0x01) because DO Control registers are “Write-
Only”. The DO Status register 0096 should be read instead to determine the current DO status.
The PMC-D726M adopts the ARM before EXECUTE operation for the remote control of its Digital
Outputs if this function is enabled through the Arm Before Execute Enable Setup register (6029), which
is Enabled by default. Before executing an OPEN or CLOSE command on a Digital Output, it must be
“Armed” first. This is achieved by writing the value 0xFF00 to the appropriate register to “Arm” a
particular DO operation. The DO will be “Disarmed” automatically if an “Execute” command is not
received within 15 seconds after it has been “Armed”. If an “Execute” command is received without first
having received an “Arm” command, the meter ignores the “Execute” command and returns the 0x04
exception code.
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