Bytes 3 And 4: Setpoint Position /(Process Setpoint, Option); Byte 5: Additional Commands - AUMA AUMATIC AC 01.2 Manual

Description of the data interface
Bits 0, 1, 2 = operation
commands
Bits 4, 5, 6 , 7
30
Bit Designation
(process representation)
2 Fieldbus SETPOINT
3 Fieldbus RESET
4 —
5 —
6 —
7 —
Bits 0 2 are used to transmit operation commands to the actuator. Only one of
these bits may be set to 1 at any given time. If several bits are set, no operation is
performed and the following signal is given: Wrong oper. cmd
For operation commands via bit 2 (Fieldbus SETPOINT):
Condition: Position transmitter (potentiometer, RWG, EWG or MWG) installed
in the actuator
If the setpoint is 0 per mil, the actuators runs to the end position CLOSED; it
runs to the end position OPEN for 1000 per mil.
If the limit of 1,000 is exceeded, the actuator completely runs to end position
OPEN.
To avoid placing too much strain on the mechanics, the reversing of direction
is delayed. The default setting in the factory for the reversing prevention time
is 300 ms.
Bits 4 through 7 are not used and must be set to 0.
Byte 2: Reserve 1
The contents are reserved for future extensions.

Bytes 3 and 4: setpoint position /(process setpoint, option)

Byte 3 = high byte, byte 4 = low byte.
The setpoint position is transmitted via bytes 3 and 4 (value: 0
position controller.
The value 1,000 corresponds to the maximum setpoint, e.g. end position OPEN.
The value 0 corresponds to the minimum setpoint, e.g. end position CLOSED.
As an alternative, the process setpoint can be transmitted via bytes 3 and 4 (value
0... 1,000), using a process controller (option). Value 1,000 corresponds to the
maximum process setpoint, value 0 to the minimum process setpoint.

Byte 5: Additional commands

Table 25: Byte 5: Additional commands
Bit Designation
(process representation)
0 Fieldb. enable LOCAL
1 Fieldb. enable OPEN
AC 01.2/ACExC 01.2 Modbus RTU
Value Description
1 Run to setpoint
Setpoint is provided via bytes 3 and 4.
In combination with a proces controller, this bit is
used to change-over between process controller
mode and OPEN-CLOSE control.
0 No command
1 Certain indications of the actuator controls can be
reset using this command in selector switch position
Remote control (REMOTE) via fieldbus (e.g. PTC
tripping device and torque fault).
The function of this bit corresponds to the push but-
ton RESET at the local controls.
0 No command
No command (reserved)
No command (reserved)
No command (reserved)
No command (reserved)
Value Description
1 Actuator operation via local controls enabled
0 Actuator operation via local controls disabled
1 Enabling operation command in direction OPEN
0 Operation command in direction OPEN disabled.
Actuator controls
1,000), using the