Supplement operating manual for DREHMO i-Matic actuators with integrated
MODBUS fieldbus interface
Wenden, 21.03.12
Page 8 of 18
Prepared by: Ste
2.3.2 Accesses for master output data ( actuator command signals)
Register Bit
Coil
Signal
Meaning
0x201
0..7
1..8
Reference value low byte
Reference value 0...1000 ppt
8..15
9..16
Reference value high byte
0x202
0
17
Automatic mode
Activates the integral 3-point position
controller
1
18
Stop
Stops the drive when automatic = 0
2
19
Close
Moves the drive to CLOSED when
automatic = 0
3
20
Open
Moves the drive to OPEN when automatic
= 0
4
21
Emergency travel (ESD)
Activates the emergency travel of the drive
5
22
Pulse operation active
Activates pulse operation when set to
external
6
23
Enable local control
Local control on station is enabled
7
24
Channel select
Channel switch over on 0 to 1 transition
8
25
Fault Acknowledge
Reset mechanism for dedicated stored
faults (e.g. torque, phase errors) as
described in actuator operation manual -
valid for software revisions greater or equal
V01.05.0048
9..15
26..32
unused
unused
0x203..
0x220
33..512
In order to access the command signals, the function codes FC 05 (Force Single Coil) or FC 06 (Preset Single
Register) are recommended to be used. The function codes FC 15 (Force Multiple Coils) and FC 16 (Preset
Multiple Registers) are also supported. The following tables give telegram examples for FC05 and FC06
function codes.
telegram example FC05 write single bit of master output data (command OPEN)
Request
C8 05 00 13 FF 00 6C 66
Checksum
value of coil (command set - TRUE)
database address (Coil 20 - command OPEN)
function code 05 write single coil (discrete command - OPEN)
slave address 200 in example
Response
C8 05 00 13 FF 00 6C 66
Checksum
value of coil (command set - TRUE)
database address (Coil 20 - command OPEN)
function code 05 write single coil (discrete command - OPEN)
slave address 200 in example
telegram example FC06 write single data of master output (setpoint value to 500)
Request
C8 06 02 00 01 F4 99 FC
Checksum
data value high- lowbyte as integer (setoint 500)
database address (decimal 512)
function code 06 write single register (commands as integer)
slave address 200 in example
Response
C8 06 02 00 01 F4 99 FC
Checksum
data value high- lowbyte as integer (setoint 500)
