Instruction Manual

3-7
IM WX1-04E
1
2
3
Index
Detailed Description of Functions
Acquiring Data at Fixed Intervals
The OPC server loads data from devices connected to the OPC server, stores it in the
data buffer (cache), and updates it at the interval set in the procedure on page 3-5 and
2-7, “Data Update Interval for Groups.” (Actually, the data is updated if the value set in
the procedure under “Percent Deadband for Groups” (page 3-5) changes to a larger
value. If the deadband is 0%, updating occurs each time.)
GateOPC loads the value stored in the internal buffer (cache) on the OPC server in
synch with the update interval specified in “Interval at Which Data is Acquired from the
OPC Server” (page 3-5 and 2-7).
The OPC server data loading operation and the GateOPC data loading operation when
the deadband is 0% is shown in the figure below.
Time
Device (PLC etc.)
Group data
update interval
Group data
update interval
Group data
update interval
Cached data Cached data Cached data Cached data
Interval at which data
is acquired from the
OPC servers
Interval at which data
is acquired from the
OPC servers
GateOPC internal buffer
OPC
Data Access
GateOPC
Time of GateOPC internal data
The time of GateOPC internal data (timestamp), is the time on the PC on which
GateOPC is running at the time point at which GateOPC read data at synchronized IO
(IOPCSyncIO).
If data was monitored by Remote Monitor, GateOPC’s data time is used.
If data was acquired from GateOPC by DAQLOGGER, it is the time at which data was
loaded by DAQLOGGER.
Test Acquisition
Using the configurator, you can connect to an OPC server and perform a test acquisition
using the synch IO (IOPSyncIO) after registering new items to groups.
Communication Retry
If the OPC server is shut down for reasons such as the PC power supply becoming
disconnected, or being closed by the user, GateOPC retries communication with all OPC
servers for which Use Retry is turned ON in the GateOPCConfigurator dialog box. The
retry time is from 30 to 3600 seconds. At the point that communication is restored, the
OPC server is created, the necessary information is retrieved from OPC, and data is
acquired.
3.2 Detailed Description of Functions