Keeping the World Flowing
27
5.1.2 Profibus Control using the ACTCON Register
A single register is provided to allow the digital control of the
actuator. Writing to the individual bits in the register causes
the actuator to open, close, stop, ESD, adopt Positioning
mode or perform a Partial Stroke and at the same time
cancels any other command set. The bit written changes any
output states already set to the new value. Only one bit may
be written in a command. If more than one bit is set then the
whole register is ignored.
ACTCON Register
Bit 6 - 15 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved Partial Stroke Position Enable ESD Open Close Stop
5.1.3 Profibus Control using the POS_DV register
To position the actuator requires a Centronik unit with a DSM
or MSM with optional potentiometer.
The analogue position control function requires two registers
to be set.
•
A desired position value to move the valve to should be
placed in the POS_DV register
•
The ACTCON register must be set to Position mode (
0010 hex)
POS_DV Register
Register value: 0 to 1000 (0 to 3E8)
Position demand: 0.0% to 100.0% of valve travel
When the ACTCON register with Position mode set is sent,
the actuator will position to the value set in the POS_DV
register and any other commands that are currently being
carried out will be cancelled.
If the POS_DV register is set to 0% and limited range
positioning is not being used the actuator will operate as
though a ‘close’ command had been sent. Similarly if the
POS_DV register is set to 100% under these conditions the
actuator will interpret the instruction as an ‘open’ command.
Note that when limited range positioning is used and the
actuator is in the fully closed position a POS_DV value of 0%,
or when the actuator is in the fully open position a POS_DV
value of 100%, are not acted upon.
The Actuator Cyclic Data Signals
A4 US
US
A4
US
A4
A4 US
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