Yokogawa GC1000 Mark II Process Gas Chromatograph - Manual (Page 20)

<4. Engineering>
4-7
IM 11B06E01-01E
TIP
The maximum number of ASGW connections applies to PCAS. When ASGW has already been connected to two
PCASs, it can accept up to 29 analyzers.
l Definition of Mapping
The Modbus address of an analyzer is mapped to ASGW.
Refer to “3.4 Modbus interface tables” for available mapping conditions.
Format = “#MAP, StnID, ASGW_Address, Target_Address”
#MAP Key word. The line start from “#MAP” is recognized as one for definition of mapping.
“#STN” needs to be defined firstly. “#MAP” defined before “#STN” is defined complains.
StnID StnID of the analyzer (defined in #STN)
ASGW_Address Modbus address of ASGW
Target_Address
Modbus address of the target analyzer
Example: “#MAP, 3, 11001, 10001”
The order of line is not restricted, and blank line is ignored.
l Specifying DO output
The alarm status of analyzers is output from the DO terminal of ASGW. Up to 16 points can be
specified. Based on two pieces of alarm information (addresses 10001 and 10002) of GC1000
which can be read through the Modbus I/F, two statuses are created: ALM_LVL1 and ALM_LVL2.
Either of these statuses can be mapped to the DO terminal of ASGW. At the start-up of ASGW,
both ALM_LVL1 and ALM_LVL2 are OFF.
GC1000
Address 10002: ON
GC1000
Address 10002: OFF
GC1000
Address 10001: ON
ALM_LVL1: keep the last value
ALM_LVL2: keep the last value
ALM_LVL1: OFF
ALM_LVL2: OFF
GC1000
Address 10001: OFF
ALM_LVL1: ON
ALM_LVL2: OFF
ALM_LVL1: OFF
ALM_LVL2: ON
Format: #DO, StnID, KeyWord, DO number
#DO The keyword for defining the mapping. A line starting with #DO is
recognized as the line for defining the alarm output at the DO terminal.
StnID StnID of an analyzer which monitors alarms (defined in #STN)
KeyWord Either ALM_LVL1 or ALM_LVL2 is specified.
DO number The DO number of ASGW from which alarms are output (1 to 16)
Definition example: #DO, 3, ALM_LVL1, 12
l Definition of Address Checking Function
Address checking function for the coil and holding register to all analyzers is overrode.
Format = “#ADDR_CHK, OFF”
Set: ON (valid) / OFF (invalid)
*: Default setting is “ON (valid)”.
*: The setting for “#MAP” is valid only after “#ADDR_CHK” is defined.
Example:
#MAP, xxxx, xxxx → Check target
#MAP, xxxx, xxxx → Check target
#ADDR_CHK, OFF
#MAP, yyyy, yyyy → Exempt from check
#MAP, yyyy, yyyy → Exempt from check
#ADDR_CHK, ON
#MAP, zzzz, zzzz → Check target
#MAP, zzzz, zzzz → Check target
4th Edition : Nov. 22, 2011-00