Function Code 05: Execute Operation - GE 735 Instruction Manual

4.2 SUPPORTED MODBUS FUNCTIONS
Modbus Implementation: Force Single Coil
735/737 Implementation: Execute Operation
This function code allows the master to request the 735/737 to perform specific operations. The operations that can be
performed by the 735/737 are as follows:
OPCODE FUNCTION
01 clear
02 remote settings
03 normal settings
04 simulation on
05 simulation off
06 test I/O on
07 test I/O off
Simulation and I/O test commands are for production testing and training simulation. Commands 02 - 07 will be ignored
4 unless communications "TEST" switch 8 is on. When a REMOTE SETTINGS command is received (TEST switch=on) the
front panel switch settings are replaced by the dial settings loaded into setpoint memory. Send command NORMAL SET-
TINGS to restore selection of front panel dial settings. If command SIMULATION ON is sent the actual phase and ground
current are replaced by the pre-loaded values in setpoint memory. The relay will respond as if these are the actual dial set-
tings and measured current values. This mode continues until power is lost or until the command "SIMULATION OFF" is
received or TEST switch 8 is set to off. Setpoints used in this mode are stored in RAM memory and are erased when con-
trol power is lost. The relay may behave erratically if invalid values are loaded into setpoint memory.
To turn on relays, LEDs and the bargraph under computer control for testing purposes, the appropriate I/O test patterns are
first loaded as setpoints using STORE SETPOINTS function 06 or 16. Then command "TEST I/O ON" is issued. Normal
relay control of this I/O hardware is suspended and the test patterns in setpoint memory are substituted. This continues
until a "TEST I/O OFF" command is received or control power is removed or TEST switch 8=off.
During testing, normal protection is disabled. As a safeguard, all test and simulation commands are ignored unless switch 8
is in the TEST on=1 position.
Message Format and Example:
Request slave 11 to execute operation code 1 (clear trip indicators).
MASTER TRANSMISSION:
SLAVE ADDRESS
FUNCTION CODE
OPERATION CODE
CODE VALUE
CRC
SLAVE RESPONSE:
SLAVE ADDRESS
FUNCTION CODE
OPERATION CODE
CODE VALUE
CRC
4-6
DESCRIPTION OPCODE
clear trip indicators 08
simulation dials 09
front panel dials 0A
simulation currents
actual currents 0B
setpoint control of I/O 0C
normal control of I/O 0D
BYTES EXAMPLE / DESCRIPTION
1 11
1 05
2 00 01
2 FF 00
2 ?? ??
BYTES EXAMPLE / DESCRIPTION
1 11
1 05
2 00 01
2 FF 00
2 ?? ??
735/737 Feeder Protection Relay
4 MODBUS COMMUNICATIONS

4.2.4 FUNCTION CODE 05: EXECUTE OPERATION

FUNCTION DESCRIPTION
disable watchdog reset main processor
enable service activate service relay & indicator
disable service deactivate service relay &
indicator
disable relays disable output relays
enable relays enable output relays
clear last trips clear 5 causes of last trips
message for slave 11
execute operation
operation code 1 = clear trip indicators
perform function
CRC calculated by the master
response message from slave 11
execute operation
operation code 1 = clear trip indicators
perform function
CRC calculated by the slave
GE Power Management