Considerations - Mitsubishi Electric MELSEC iQ-R Series User Manual

Considerations

The following shows the considerations for the recording function.
When using an SFC program
Make sure that only one SFC program is included in a project when using 'device/label batch specification.'
If multiple SFC programs are included in a project, 'include SFC device' of 'device/label batch specification' cannot be used.
To perform the recording function if multiple SFC programs are included, use 'specify the device range' to specify a step relay
with block specification (BL\S) to be sampled.
In addition, when specifying a block or step not included in an SFC diagram as a sampling target in advance for future use,
use 'specify the device range' to specify a step relay with block specification (BL\S) as a sampling target.
When setting SFC devices as sampling targets
By changing programs (program files or FB files) or CPU parameters after writing them to a programmable controller, SFC
devices may not be included or included in the sampling target.
After changing them, write them to the programmable controller again.
(When performing verification before writing, the result may be mismatched.)
When starting the recording function
The recording function does not start if parameters, programs, and FBs written to a CPU module are different from those
applied when configuring the recording setting.
When performing a function or an operation to change a file in a CPU module (such as boot operation
card or the backup/restore function of the CPU module), write parameters, programs, and FBs applied when configuring the
recording setting to the CPU module.
*1 Not supported by safety CPUs.
Scan time extension
The scan time is extended while the recording function is running.
It is also affected by the size, device address (number), or type of data to be sampled, and devices (buffer memory, link
devices) that access a module.
By default, 'device/label batch specification' is enabled; therefore, the number of devices and labels to be sampled increases
and the scan time becomes longer.
When specifying a timeout as a condition for satisfying a file saving trigger
■Setting the timeout time
A value in a device of a CPU module specified as a condition for satisfying a file saving trigger is sampled during the END
processing in a sequence scan.
Therefore, when specifying a timeout as a condition for satisfying a file saving trigger, set the timeout time longer than the
scan time.
Otherwise, a file saving trigger is always satisfied by timeout detection for every scan.
■Starting counting the timeout time
Counting the timeout time starts at the following timings:
• The value in 'Timeout detection of file saving trigger' (Un\G4008) is changed from 'disabled' to 'enabled.'
• The value in a specified device changes.
■Stopping counting the timeout time
Counting the timeout time stops in the following cases:
• The value in 'Timeout detection of file saving trigger' (Un\G4008) is changed from 'enabled' to 'disabled.'
• The operating status switches to 'stopped' or 'preparing.'
• A file saving trigger is satisfied by timeout detection. (Counting the timeout time of the satisfied trigger stops; therefore, a
trigger is not satisfied by timeout detection unless the counting starts again.)
*1
from an SD memory
1 FUNCTIONS
83
1.1 Recording Function
1