Running by Virtual External Inputs Section 8-4
176
8-4 Running by Virtual External Inputs
8-4-1 Running by Virtual External Inputs
How to Run by Virtual External Inputs
Perform running by virtual external inputs in the following 3 methods.
1. By Data Replay Tool
2. By the I/O Condition Tool
3. By the ladder program for debugging
Note
Be careful when performing Run-mode operation from the [Debug Console]
while executing the Data Replay Tool or I/O Condition Tool. If the [Continuous
Run] button is pressed during a Synchronous process, synchronism may be
lost temporarily. Also, if the [Pause] (, [Scan Run], or [Step Run]) button is
pressed during an Asynchronous process, the virtual external input data will
be replayed even if the ladder execution is interrupted temporarily.
Synchronous/Asynchronous Processes
In the Data Replay Tool and I/O Condition Tool, whether or not to perform
synchronous process can be selected.
The Synchronous (Replay) process is a process where the Ladder Engine and
each tool operate synchronously in the unit of a scan. If the Synchronous
process is not performed (Asynchronous process), setting/monitoring of I/O
memory values from each tool to the Ladder Engine are performed asyn-
chronously with scan of the Ladder Engine. In this case, like operation to an
actual PLC, scan from each tool to the Ladder Engine is will not be performed.
When using multiple tools at the same time, execute the synchronous process
on one tool. Perform the other tools asynchronously.
Note
Synchronous execution of multiple tools will lose synchronism in the unit of a
scan for each tool. Execute one tool synchronously and the others asyn-
chronously or alternatively execute all tools asynchronously.
Virtual Cycle Time and Computer Cycle Time
When performing virtual external inputs, use the Simulator in the Computer
Cycle Time. In the Synchronous process, the execution result will be the same
for Virtual Cycle Time and Computer Cycle Time. In the Asynchronous proc-
ess, on the other hand, the result will be different because the time elapses
differently between the Ladder Engine and tools in Virtual Cycle Time and the
timing of data setting is different from that of Computer Cycle Time.
8-4-2 How to Run by Data Replay Tool
The [Data Replay Tool] reads the data of the specified replay file (Command
log file, Data Trace file, or Data Replay file) and set the data to the Ladder
Engine in sequence. Furthermore, the changes caused by setting of the data
can be saved to an output file as monitor data.
To Next Page
Loading...
Need help?
General