A-4 Modbus-RTU Example Connection MN448
A.7 Control and Status Register Descriptions
Read-Write Registers
Register 1: Drive Control Word
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
High byte Low byte
Bit 0: Run/Stop command: Set to 1 to enable the drive. Set to 0 to stop the drive.
Bit 1:
Bit 2:
User must clear this bit when drive is under normal condition to prevent un-expected reset.
Bit 3:
For normal operation, Bit 3 has the highest priority, bit 0 has the lowest priority (bit 3>bit 1>bit 0). For example if user set
command as 0x0009, drive will do a coast stop rather than run. For normal run/start, just set this register to 1.
Note that stat/stop (bit 0), fast stop (bit 1) and coast stop (bit 3) only works if 1100= 0 or 1. Otherwise, start/stop function is
controlled by drive control terminals. Reset function (bit 2) works all the time as long as drive is operated under Modbus control
mode (1103=3 or 4).
Register 2: Speed Reference
This register holds the speed reference value with one decimal place (200 = 20.0Hz). The maximum speed reference value is
limited by 2008. Either register 2 or register 5 can be used for speed reference control, however only one reference should be
used in any control system, otherwise unexpected behaviour can result.
Register 4: Acceleration / Deceleration Ramp Time
Active only when 1103 = 4, this register species the drive acceleration and deceleration ramp time. The same value is applied
simultaneously to the acceleration and deceleration ramp times. The value has two decimal places, e.g. 500 = 5.00 seconds.
Read Only Registers
Register 6: Drive status and error code
High byte gives drive error code. (Valid when the drive is tripped, see Appendix D – Drive Fault Code and Information for further
details)
Low byte gives drive status information as follows :-
Bit 0: 0 =Drive Stopped, 1 = Drive Running
Bit 1: 0 = OK, 1 = Drive Tripped
Bit 5: 0 = OK, 1 = In Standby Mode
Bit 6: 0 = Not Ready, 1 = Drive Ready to Run (not tripped, hardware enabled and no mains loss condition)
A.8 Parameter Registers and Scaling
All user adjustable parameters within the drive are accessible by Modbus, and can be Read or Written to. For further
information regarding the parameter functions and specic settings, please refer to the User Guide.
Register Parameter Description Format Min Max Data format / scaling
130 1100
Keypad restart
mode
U16 0 7 See user guide for details
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