6. COMMUNICATIONS
SUPPORTED MODBUS FUNCTIONS
6-13
6.3.9
FUNCTION CODE 16 - PERFORMING COMMANDS
Some PLCs may not support execution of commands using function code 5 but do support storing multiple setpoints using function code
16. To perform this operation using function code 16 (10H), a certain sequence of commands must be written at the same time to the
SR469. The sequence consists of : Command Function register, Command operation register and Command Data (if required). The
Command Function register must be written with the value of 5 indicating an execute operation is requested. The Command Operation
register must then be written with a valid command operation number from the list of commands shown in the memory map. The Com-
mand Data registers must be written with valid data if the command operation requires data. The selected command will execute imme-
diately upon receipt of a valid transmission.
Message Format and Example:
Perform a reset on SR469 (operation code 1).
Master Transmission
Bytes
Example (hex)
SLAVE ADDRESS
1
0B
message for slave 11
FUNCTION CODE
1
10
store Setpoints
DATA STARTING ADDRESS
2
00
Setpoint address 0080
80
NUMBER OF SETPOINTS
2
00
2 Setpoints (4 bytes total)
02
BYTE COUNT
1
04
4 bytes of data
COMMAND FUNCTION
2
00
data for address 0080
05
COMMAND OPERATION
2
00
data for address 0081
01
CRC
2
0B
CRC calculated by the master
D6
Slave Response
SLAVE ADDRESS
1
0B
message from slave 11
FUNCTION CODE
1
10
store Setpoints
DATA STARTING ADDRESS
2
00
Setpoint address 0080
80
NUMBER OF SETPOINTS
2
00
2 setpoints
02
CRC
2
40
CRC calculated by the slave
8A
Summary of Contents for SR469
Page 7: ......
Page 19: ...2 INSTALLATION MECHANICAL 2 5 2 1 5 TERMINAL LOCATIONS Figure 2 11 TERMINAL LAYOUT...
Page 21: ...2 INSTALLATION ELECTRICAL 2 7 Figure 2 12 TYPICAL WIRING DIAGRAM...
Page 32: ...ELECTRICAL 2 INSTALLATION 2 18 2 2 14 TYPICAL 2 SPEED MOTOR WIRING...
Page 39: ...OVERVIEW 3 SR469 OPERATION 3 6 yy SETPOINTS yy S1 SR469 SETUP...
Page 104: ...4 SETPOINT PROGRAMMING S11 MONITORING 4 65 Figure 4 24 TRIP COIL SUPERVISION...
Page 113: ...S12 ANALOG I O 4 SETPOINT PROGRAMMING 4 74...
Page 244: ...8 469PC PROGRAM WAVEFORM CAPTURE 8 13 Figure 8 11 WAVEFORM CAPTURE...
