Yokogawa GC1000 Mark II Process Gas Chromatograph - Manual (Page 36)

<6. OPC DA 2.0 Interface>
6-1
IM 11B06E01-01E
6. OPC DA 2.0 Interface
This chapter explains the OPC DA 2.0 interface of ASGW and ASIU.
Adding an OPC server of STARDOM to the system allows ASGW/ASIU to have the OPC in-
terface. There is no need to add any special settings to the ASGW/ASIU application. Map-
ping Modbus data of ASIU to ASGW allows ASIU data to be read and written by accessing
ASGW through the OPC interface.
6.1 System Configuration
GC8000
ASIU ASGW
Ethernet
OPC Server PC
GC1000 MarkII
F0601.ai
6.2 Software Required
ASGW do not require additional software to be installed for OPC. The STARDOM software listed
below is required for a PC on which an OPC server is to be installed.
Model Item Remark
NT781AJ FCN/FCJ OPC Server for Windows
NT783AJ Redundant Network Function License
for FCN/FCJ OPC Server
Required only for redundant network.
6.3 Installation and Settings
For installation and settings of the OPC server and the duplexed package, refer to their respec-
tive user’s manuals or online help.
6.4 Update rate
Data for the OPC interface is updated every second. Therefore, a delay of about one second
may occur when the OPC client reads the latest data from analyzers.
TIP
Separating OPC data from Modbus data causes hogging of the CPU. To avoid this, the OPC data update rate is
set to 1 second while the Modbus communication is updated every 200 ms.
4th Edition : Nov. 22, 2011-00