CET Electric Technology
52
5.9 Time
There are two sets of Time registers supported by the PMC-33M-A – Year / Month / Day / Hour / Minute
/ Second (Registers # 60000 to 60002) and UNIX Time (Register # 60004). When sending time to the
PMC-33M-A over Modbus communications, care should be taken to only write one of the two Time
register sets. All registers within a Time register set must be written in a single transaction. If registers
60000 to 60004 are being written to at the same time, both Time register sets will be updated to reflect
the new time specified in the UNIX Time register set (60004) and the time specified in registers 60000-
60002 will be ignored. Writing to the Millisecond register (60003) is optional during a Time Set operation.
When broadcasting time, the function code must be set to 0x10 (Pre-set Multiple Registers). Incorrect
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.
0x386D4380 to 0x 7FE8177F
The corresponding time is
2000.01.01 00:00:00 to
2037.12.31 23:59:59
(GMT 0:00 Time Zone)
Table 5-31 Time Registers
5.10 Remote 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-33M-A does
not support the Read Coils command (Function Code 0x01) because DO Control registers are “Write-
Only”. The DO Status register 0098 should be read instead to determine the current DO status.
The PMC-33M-A 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 (6032), which is
disabled 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.
Writing “0xFF00”
to the register to
perform the
described action.
Table 5-32 DO Control
5.11 Clear/Reset Control
Writing “0xFF00”
to the register to
execute the
described action.
Clear 3-Ø Total and Per-Phase Energy
Registers
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