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MODBUS RTU PROTOCOL
5.8
Modbus Commands
CG42
The following commands can be sent to Modbus address 0x0080 (format code F31).
Commands 1 to 4 can also be sent using Modbus function code 5 (Execute Operation).
•
Command 1 (Remote Reset 369): Modbus Command 1 will attempt to clear the status
of protection elements and output relay states.
•
Command 2 (Motor Start): Modbus Command 2 will activate the programmed start
relay, as long as it is not currently active and the stop relay is not currently active.
•
Command 3 (Motor Stop): Modbus Command 3 will activate the trip relay as long as it
is not currently active and the start relay is not currently active.
•
Command 4 (Waveform Trigger): Modbus Command 4 will trigger the waveform
capture trace memory.
•
Command 6 (Clear Trip Counters): Modbus Command 6 will clear all trip counters.
•
Command 7 (Clear Last Trip Data): Modbus Command 7 will clear the last trip data.
•
Command 10 (Clear RTD Maximums): Modbus Command 10 will initialize all RTD (and
Remote RTD, if applicable) maximum data to default values.
•
Command 11 (Reset Motor Info): Modbus Command 11 will clear the number of
motor starts, number of motor restarts, motor running hours, and number of restart
attempts. It will also clear all learned motor statistics and Data Logger data.
•
Command 12 (Clear/Reset All Data): Modbus Command 12 will clear all event data,
trip counters, last trip data, peak demand data, RTD maximums data, motor statistics
data, Data Logger data, and all energy data.
•
Command 20 (Protection Function Blocking): This command must be sent using
Modbus function code 10h (Store Multiple Setpoints). This allows the 369 to accept the
two required 16-bit values in one transmission. The first data word is the command
number (20). The 2nd data word contains the bitmask information for which functions
to block/unblock as per format code F180.
When this command is sent to the 369, the protection function blocking setpoints
(Modbus addresses 1520 to 1528) are updated accordingly. For example, for Bit 0 in
the 2nd data word, the setpoint value for Block Undercurrent/Underpower at address
1521 will be modified to contain either a "1" or "0", depending on the bit value.
Refer to the 369 Instruction Manual, chapter 5: Block Functions for additional
information about the protection function blocking feature.
•
Command 21 (Force Output Relays): Modbus Command 20 must be sent using
Modbus function code 10h (Store Multiple Setpoints). This allows the 369 to accept the
two required 16-bit values in one transmission. The first data word is the command
number (21). The 2nd data word contains the bitmask information for which relays to
energize/de-energize as per format code F141.
The purpose of this command is to allow the control of the output relay status,
regardless of the motor status (running, stopped, etc.). Only relays that have been
programmed under the
this command.
Refer to the 369 Instruction Manual, chapter 5: Force Output Relays for more
information about the force output relays feature.
ASSIGN COMMS FORCE RELAYS
369 MOTOR MANAGEMENT RELAY – COMMUNICATIONS GUIDE
CGCOMMUNICATIONS GUIDE
setpoint can be forced using
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