Yokogawa GC1000 Mark II Process Gas Chromatograph - Manual (Page 13)

<3. Functions>
3-4
IM 11B06E01-01E
Holding register (40001 to 49999)
Data Address Description
Time setting
value
40001
40002
40003
40004
Setting the clock time.
For data format, refer to “5.3 Holding Register (set data)” in “GS 11B08B02-
01E GC8000 Modbus Communication” or “GS 11B03G02-02E GC1000
MarkII Modbus Communication”.
The data are kept after writing on the analyzer and PCAS.
Mapping area 41001 to
49000
Setting the input register or holding register address of analyzers.
ASGW only reads the input register on the analyzer.
ASGW only writes the holding register on the analyzer.
The holding registers are as follows.
GC8000:
Refer to “5.3 Holding registers (setting data)” in “GS 11B08B02-01E
GC8000 Modbus Communication”. However, “40001-40004: Time Setting
Request” is not available.
GC1000 MarkII:
Refer to “5.3 Holding Register (set data)” in “GS 11B03G02-02E GC1000
MarkII Modbus Communication”. However, neither “40001-40004: Time
Setting Request” nor “41DDD: Analysis value” is available.
The other address area is ignored. The holding register in PCAS and ASIU
can not be set.
Input register (30001 to 39999)
Data Address Description
Mapping area 31001 to 39000 Setting the input register address of analyzers.
ASGW reads the addressed data from analyzers.
l Access to the address not listed or mapped
Access to the address that is not shown on the table or not mapped does not generate an error.
However, the value of data is uncertain.
DCS can not write to the coil or holding register of ASGW that is not defined in the table above.
However, with setting “#ADDR_CHK, OFF” after-mentioned, DCS can write to thecoil or holding
register of ASGW.
l Retry to writing
When an error occurs in writing to the coil or holding register of analyzers and PCAS, ASGW tries
to write the specified number of times. The number of retry times can be specified on the setting
file.
l Character time-out
Value of character time-out for communication between DCS and Modbus RTU can be set ac-
cording to communication speed. The value of mean time of each characters is set on the setting
file.
l Holding time of Data renewal bits
The variable data bits such as Data renewal, Renewal of Calibration Coefficient and Alarm Status
Change and be held for a constant time for DCS reading. Holding time can be specified. The unit
is second.
l TCP time-out
Value of time-out for Modbus TCP communication. The unit is second. 1 second or more is rec-
ommended.
4th Edition : Nov. 22, 2011-00