Profibus DP Mk2 Option Card Installation Manual
48 of 84
Publication PUB088-005-00_1017
5.3 Actuator Analogue Input Feedback
The Profibus DP Module (Mk2) makes available over the network a number of analogue variables.
These contain information about the valve and actuator. If the single highway with analogue input
variant of the Profibus DP Module (Mk2) is used, one associated plant measurement is also available.
Name
Register Range
Analogue
Feedback
IQ &
IQT
Q
CVA
Skil/
EH
ROM
PAK
TORQUE
2
0-120
(0-78 hex)
= 0-120%
Actuator
Instantaneous Torque
POSITN
3
0-1000 (0-3E8 hex)
= 0-100%
Valve Position
TEMPER
4
32768
– 65535
(8000
– FFFF hex)
= -32767 to -1
O
C
0 (0 hex) = 0
O
C
1
– 32767
(0001
– 7FFF hex)
= 1 to 32767
O
C
Temperature
O
C
ANALOG
5
0-1000
(0-3E8 hex)
= 0-100%
Analogue Input
PORTST
6
1-10 (1-A hex)
= Position 1 to 10
Multiport position
Note:
– Requires the Single H Analogue Input Profibus DP Module (Mk2)
Torque
The currently developed torque value is reported as an Integer Value
in the range 0 to 120 (0-78 hex) representing the percentage of
actuator rated torque generated.
Valve Position
The current valve position is reported as an Integer Value in the range
0 to 1000 (0
– 3E8 hex) representing the percentage position to 0.1%
resolution.
The actuators automatically scale the valve position value reported
from the setting of the limit switches, although the Q actuator requires
the valve to be stroked fully between the closed and open limit
switches for the value to be automatically scaled. This scaling is
retained in EEPROM when the actuator power is removed.
If Limited Range Positioning is invoked by setting the appropriate
parameters, then the reported valve position 0 to 100% follows the
limited range of valve travel.
Temperature
The actuator internal temperature is reported as a 2’s complement
integer value in the range
–32767 to +32767
O
C.
[A value of 0 is 0
O
C, 32767 (7FFF hex) is 32767
O
C, 65535 (FFFF
hex) is
–1
O
C and 32768 (8000 hex) is
–32767
O
C.]
