Modbus Rtu Communication Specification - Mitsubishi Electric FR-CC2-H315K Instruction Manual

 Converter status monitor
Instruction
Item
code length
Converter
status H7A 8 bits
monitor
Converter
status
H79 16 bits
monitor
(extended)
*1 The signal within parentheses ( ) is the initial status. The description changes depending on the setting of Pr.190 to Pr.195 (Output terminal
function selection).
5.7.6

MODBUS RTU communication specification

Operation or parameter setting via communication is possible using the MODBUS RTU communication protocol through RS-
485 terminals on the converter unit.
Pr. Name
331 RS-485 communication
N030 station number
332 RS-485 communication
N031 speed
334 RS-485 communication parity
N034 check selection
343
Communication error count
N080
MODBUS RTU
539
communication check time
N002
interval
549
Protocol selection
N000
Bit
*1
Description
b0: RDB (Inverter operation enable
(NC contact))
b1: Fixed to 0
b2: Fixed to 0
b3: RDA (Inverter operation enable
(NO contact))
b4: RSO (Inverter reset)
b5: IPF (Instantaneous power failure/
undervoltage)
b6: FAN (Fan fault output)
b7: ABC1 (Fault)
b0: RDB (Inverter operation enable
(NC contact))
b1: Fixed to 0
b2: Fixed to 0
b3: RDA (Inverter operation enable
(NO contact))
b4: RSO (Inverter reset)
b5: IPF (Instantaneous power failure/
undervoltage)
b6: FAN (Fan fault output)
b7: ABC1 (Fault)
b8 to b14: —
b15: Fault occurrence
Initial Setting
value range
0
0
1 to 247
3, 6, 12, 24,
48, 96, 192,
96
384, 576,
768, 1152
0
2 1
2
0 —
0
9999
0.1 to 999.8 s
9999
0
0
1
[Example 1] H01...Inverter operation
enable signal (NC contact) ON
b7
0 0
[Example 2] H80...Fault occurrence
b7
1 0
[Example 1] H0001...Inverter operation enable signal (NC contact) ON
b15
0 0 0 0 0 0 0 0
[Example 2] H8080...Fault occurrence
b15
1 0 0 0 0 0 0 0
Description
Broadcast communication
Specify the converter unit station number.
Set the converter unit station numbers when two or more converter
units are connected to one personal computer.
Select the communication speed.
The setting value × 100 equals the communication speed.
For example, enter 96 to set the communication speed of 9600 bps.
Parity check disabled.
Stop bit length: 2 bits.
Parity check (odd parity) enabled.
Stop bit length: 1 bit.
Parity check (even parity) enabled.
Stop bit length: 1 bit.
Displays the communication error count during MODBUS RTU
communication. Read-only.
The MODBUS RTU communication is available, but a communication
error occurs.
Set the interval of the communication check (signal loss detection)
time (Same specifications as Pr.122)
No communication check (signal loss detection)
Mitsubishi inverter protocol (computer link)
MODBUS RTU protocol
5.7 (N) Communication operation parameters
Example
b0
0 0 0 0 0 1
b0
0 0 0 0 0 0
b0
0 0 0 0 0 0 0 1
b0
1 0 0 0 0 0 0 0
5. PARAMETERS
1
2
3
4
5
6
7
8
9
10
131