Mitsubishi Electric QJ71MB91 User Manual page 10

3.5.1 Buffer memory list................................................................................................................... 3 - 13
CHAPTER4 MODBUS STANDARD FUNCTIONS
4.1 MODBUS Standard Function Support List ...................................................................................... 4 - 1
4.2 Frame Specifications ..................................................................................................................... 4 - 10
4.2.1 Frame mode ........................................................................................................................... 4 - 11
4.3 Protocol Data Unit Formats by Functions ...................................................................................... 4 - 15
4.4 Read Coils (FC: 01) ....................................................................................................................... 4 - 18
4.5 Read Discrete Inputs (FC: 02) ....................................................................................................... 4 - 19
4.6 Read Holding Registers (FC: 03)................................................................................................... 4 - 20
4.7 Read Input Registers (FC: 04) ....................................................................................................... 4 - 21
4.8 Write Single Coil (FC: 05) .............................................................................................................. 4 - 22
4.9 Write Single Register (FC: 06) ....................................................................................................... 4 - 23
4.10 Read Exception Status (FC: 07) .................................................................................................... 4 - 24
4.11 Diagnostics (FC: 08) ...................................................................................................................... 4 - 25
4.11.1 Return query data (sub-function code: 00) ............................................................................. 4 - 25
4.11.2 Restart communications option (sub-function code: 01)......................................................... 4 - 26
4.11.3 Return diagnostic register (sub-function code: 02) ................................................................. 4 - 28
4.11.4 Change ASCII input delimiter (sub-function code: 03)............................................................ 4 - 30
4.11.5 Force listen only mode (sub-function code: 04)...................................................................... 4 - 31
4.11.6 Clear counters and diagnostic register (sub-function code: 10) ............................................. 4 - 33
4.11.7 Return bus message count (sub-function code: 11) ............................................................... 4 - 35
4.11.8 Return bus communication error count (sub-function code: 12)............................................. 4 - 36
4.11.9 Return bus exception error count (sub-function code: 13)...................................................... 4 - 37
4.11.10 Return slave message count (sub-function code: 14) ............................................................ 4 - 38
4.11.11 Return slave no response count (sub-function code: 15) ....................................................... 4 - 39
4.11.12 Return slave NAK count (sub-function code: 16).................................................................... 4 - 40
4.11.13 Return slave busy count (sub-function code: 17) ................................................................... 4 - 41
4.11.14 Return bus character overrun count (sub-function code: 18) ................................................. 4 - 42
4.11.15 Return IOP overrun error count (sub-function code: 19) ........................................................ 4 - 43
4.11.16 Clear overrun counter and flag (sub-function code: 20) ......................................................... 4 - 44
4.12 Get Communications Event Counter (FC: 11) ............................................................................... 4 - 45
4.13 Get Communications Event Log (FC: 12) ...................................................................................... 4 - 47
4.14 Write Multiple Coils (FC: 15) .......................................................................................................... 4 - 50
4.15 Write Multiple Registers (FC: 16)................................................................................................... 4 - 52
4.16 Report Slave ID (FC: 17) ............................................................................................................... 4 - 53
4.17 Read File Record (FC: 20) (SC: 06) .............................................................................................. 4 - 55
4.18 Write File Record (FC: 21) (SC: 06) .............................................................................................. 4 - 57
4.19 Mask Write Register (FC: 22) ........................................................................................................ 4 - 59
4.20 Read/Write Multiple Registers (FC: 23) ......................................................................................... 4 - 60
CHAPTER5 FUNCTIONS
5.1 Function List .................................................................................................................................... 5 - 1
A
- 8
4 - 1 to 4 - 60
5 - 1 to 5 - 22