rotork Modbus - Broadcast Commands; Data Location Offsets; Data Locations; Data Accessed with Function Code 01 - Read Coils

Modbus MFU Option Card Installation Manual
44 of 64 Publication PUB091-004-00_0918
7.4 Broadcast Commands
Broadcast commands are only supported for specific registers, coils and commands.
 Stop and ESD Code 05 writes to coils 0 (Stop) and 3 (ESD) are supported for
address 0 broadcast.
Code 06 writes to register 5 (Actuator Digital Control) with values 0
(Stop) and 3 (ESD) are supported for address 0 broadcast.
7.5 Data Location Offsets
The locations given in the database are those which should appear in the messages as they are
transmitted on the Modbus link. Some host systems offset the addresses so far as the user is
concerned. In such cases, the address programmed into the host would be different to those listed. All
data locations listed start from 0. Please check the host system documentation carefully to determine
if any offsets are required.
Typical Offsets are:
Function
Code
Offset to be added to
formulae result
01
1
02
10001
03
40001
04
30001
05, 15
1
06, 16
40001
7.6 Data Locations
The data locations in the following tables are all numbered from 0. For a definition of the actuator
functions listed refer to section 5. For the DO-1 to DO-4 options, the extra relay output board must be
fitted. This can only be fitted in the IQ3.
7.6.1 Data Accessed with Function Code 01 - Read Coils
Location
(Bit)
R/W
Data
Range
0
R/W
Stop command output coil status
0 - 1
1
R/W
Close command output coil status
0 - 1
2
R/W
Open command output coil status
0 - 1
3
R/W
ESD command output coil status
0 - 1
4
R/W
DO-1 output coil status (extra relay S5) ①
0 - 1
Note: All data locations listed start from 0; it may be necessary to add an offset to match the
number required for the PLC.