Modbus Data Mapping - Vacon 100 User Manual

Communications
6.3

Modbus data mapping

6.3.1 Coils registers
A "coil" in Modbus is a single-bit binary data item which can be both read and written. In Vacon
100 the coils refer to some bits in the fieldbus control word." See page 34.
Address
0001 RUN/STOP
0002 Direction
0003 Fault reset
6.3.2 Discrete inputs
A "discrete input" in Modbus is a single-bit binary data item which is read-only. In Vacon 100
the discrete inputs refer to the fieldbus status word
Address
10001 Ready
10002 Run
10003 Direction
10004 Fault
10005 Alarm
10006 At reference
10007 Zero speed
10008 Flux ready
6.3.3 Holding registers and input registers
An "input register" in Modbus is a 16-bit value which is read-only. A "holding register" in Mod-
bus is a 16-bit value which can be both read and written. Holding and input registers are ac-
cessed using different function codes, and the address ranges are different. In Vacon 100 the
same information can be accessed as input registers and holding registers, i.e. input register
X refers to the same 16-bit value as the holding register X.
The Modbus registers are mapped to the Vacon 100 drive as follows
24-hour support +358 (0)40 837 1150 • Email: vacon@vacon.com
Table 13. Defined coil registers
Function
bits.
Table 14. Defined Input Discrete
Function
Purpose
Control Word, bit 0
Control Word, bit 1
Control Word, bit 2
See page 37.
Purpose
Status Word, bit 0
Status Word, bit 1
Status Word, bit 2
Status Word, bit 3
Status Word, bit 4
Status Word, bit 5
Status Word, bit 6
Status Word, bit 7
vacon • 32
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