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Model 2000 Flow Computer Instruction Manual
APPENDIX 3 GAS CHROMATOGRAPHS SUPPORTED
Model 2000 issue 21
Page No
79
APPENDIX 3c
Siemens Optichrome Chromatograph
Gas Component
Default Address
Number Format
Status
30001
unsigned 16 bit integer
Unit will continue to read the above register until the following conditions are correct
30001 is greater than the alarm limit value
When these conditions are met it will continue to read addresses 41701 to 43101
Gas Component
Default Address
Number Format
Nitrogen N2
41701
unsigned 16 bit integer
Carbon Dioxide CO2
41901
unsigned 16 bit integer
Rel dens
42701
unsigned 16 bit integer
Superior Heating Value Hs
42601
unsigned 16 bit integer
Inferior Heating Value Hi
42801
unsigned 16 bit integer
Methane C1
41801
unsigned 16 bit integer
Ethane C2
42101
unsigned 16 bit integer
Propane C3
41201
unsigned 16 bit integer
i-Butane i-C4
41301
unsigned 16 bit integer
n-Butane n-C4
41401
unsigned 16 bit integer
i-Pentane i-C5
41501
unsigned 16 bit integer
n-Pentane n-C5
41601
unsigned 16 bit integer
C6+
41101
unsigned 16 bit integer
Wobbe (superior)
43101
unsigned 16 bit integer
The Siemens Optichrome interface supports the Following Modbus commands only
1)
Read requests of Data Registers
[T1-T2-T3-T4]KK03ssssnnnn<CRC>[T1-T2-T3-T4]
2)
Read requests of Status Registers
[T1-T2-T3-T4]KK04ssssnnnn<CRC>[T1-T2-T3-T4]
3)
Force Single Coil Instruction (Sent Automatically every 10 seconds)
[T1-T2-T3-T4]KK05<FF00><CRC>[T1-T2-T3-T4]
The Expected responses to the above packets from the GC are as follows:-
1)
Valid Data Read Requests:
[T1-T2-T3-T4]KK03bb<DATA><CRC>[T1-T2-T3-T4]
2)
Valid Status Read Requests:
[T1-T2-T3-T4]KK04bb<DATA><CRC>[T1-T2-T3-T4]
3)
Force Single Coil Instruction
[T1-T2-T3-T4]KK05<FF00><CRC>[T1-T2-T3-T4]
Where:
a)
[T1-T2-T3-T4] is at least 3.5 character times of silent interval.
b)
KK is the identification number.
c)
03 hex is the Modbus code "Read multiple holding registers".
d)
04 hex is the Modbus code "Read Input register".
e)
05 hex is the Modbus code "Force Single Coil".
f)
ssss is the start address in the range 0000 to FFFF (0 to 63535 decimal).
g)
nnnn number of registers in the range 0001 to 00FF (1 to 255 decimal).
h)
bb is the number of bytes to be transferred.
i)
<FF00> is the Single Coil address.
j)
<DATA> data nnnn items.
l)
<CRC> CRC Checksum.
Summary of Contents for 2000
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