Technical information

10
Values transmitted by the
Field Protocols
The following values can be transmitted by the communication protocols:
Tank Value Symbol V1 - old V1 - new Modbus WM550 BPM
Mark/
Space
L&J
Tankway
Basic
L&J
Tankway
Servo
GPE
Level L yes yes yes yes yes yes yes yes yes
Temperature (Product) T
P
yes yes yes yes yes yes yes yes yes
Observed Density D
obs
- yes yes yes yes - - yes -
Water Level L
W
- yes yes yes yes - - yes -
Pressure 1 (Bottom) P
1
- yes yes yes
1
yes - - - -
Pressure 2 (Middle) P
2
- yes yes yes
1)
-----
Pressure 3 (Top) P
3
- yes yes yes yes - - - -
Measured Level L
M
- - yes yes
1
-----
Level Correction L
C
- - yes yes
1
-----
Percentage Level L
%
- - yes yes - - - - -
Vapour Temperature T
V
- yes yes yes
1
yes - - - -
Air Temperature T
A
- - yes yes
1
yes - - - -
Level Flow Rate
(Rate of change of level)
- - yes yes
1
-----
Volumetric Flow Rate - - yes yes
1
-----
General Purpose Value 1 GP
1
- yes yes yes
1
-----
General Purpose Value 2 GP
2
- yes yes yes
1
-----
General Purpose Value 3 GP
3
- - yes yes
1
-----
General Purpose Value 4 GP
4
- - yes yes
1
-----
Multi-Element
Temperatures
T
(1)
to T
(16)
- yes yes T
(1)
to T
(15)
-----
Alarm/Discrete Values yes
2)
yes
2
yes yes yes
3)
yes
4)
yes
5)
yes
5
-
Discrete Output Control --yes-----1
Additional - 4-20mA
6)
yes Level % - - Temp
7)
-4-20mA
6
Protocol Documentation KA 246F KA 246F KA 245F KA 247F KA 248F KA 249F KA 250F KA 250F KA 251F
1) Only accessible through WM550 extended tasks (51&52); not available on older control room systems.
2) The protocol allows 2 alarm and 4 general purpose flags which can be connected to any alarm or discrete input.
3) Level L & H alarm, 4 alarms and 2 general purpose flags which can be connected to any alarm or discrete input.
4) The protocol allows 2 digital alarm values which can be connected to any alarm or discrete input.
5) The protocol allows 2 digital values which can be connected to any alarm or discrete input.
6) One additional value "4-20mA" which can be connected to any value, however range of value sent is limited (see KA 246F for details).
7) One additional value "Temp2" which can be connected to any value, however the range of value sent is limited (see KA 250F for details).