Input Hold Function - Mitsubishi Electric R60AD8-G User Manual

Input HOLD function

This function holds the digital operation value for the specified time after safety refresh data receiving has an interrupt.
Input HOLD occurrence
When the R60AD8-G detects that safety refresh data receiving has an interrupt, the R60AD8-G holds the digital operation
value immediately before the interrupt. The module also holds the previous digital obtained value of the safety device
specified by the SIL2 diagnostic FB library.
Input HOLD release
After the input HOLD (safety refresh data receiving has an interrupt), when safety refresh data is successfully received within
the time set in the "Safety I/O Hold Time" of the "CPU Parameter", the HOLD for the digital operation value is cleared.
Updating of the digital obtained value of the safety device specified by the SIL2 diagnostic FB library is resumed.
Safety I/O HOLD time exceeded error
When the time of holding digital operation value exceeds the time set with "Safety I/O Hold Time" in "CPU Parameter", a
safety I/O HOLD time exceeded error (error code: 1500H) will occur. The R60AD8-G holds the previous digital obtained value
of the safety device specified by the SIL2 diagnostic FB library, but updating is restarted when it receives safety refresh data
again.
The safety I/O HOLD time exceeded error (error code: 1500H) can be cleared by any of the following methods.
• i_bUnitErrClear (module error clear) of the SIL2 safety program FB
• [Clear Error] button on the "Module Diagnostics" window
10 FUNCTIONS
10.8 SIL2 A/D Conversion Function
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