Yokogawa EJX930A - Manual (Page 92)

<Appendix 2. Integrator (IT) Block>
A2-8
IM 01C25T02-01E
When OP_CMD_INT has become "H" and a reset was made, OP_CMD_INT automatically returns to "L."
Even if RESET_IN becomes "H," activating a reset, RESET_IN does not automatically return to "L."
The RESET_IN setting will not be retained if the power is turned OFF.
A2.6.2 Reset Timing
All items are reset during execution of the function block. Therefore, the minimum period of a reset is the block
execution period.
● 5-second rule
If a reset is made, the next reset will not be accepted for 5 seconds after that.
Even if UP_AUTO (or DN_AUTO) is activated and TOTAL_SP (or 0) is reached within 5 seconds, the next
reset will not be made for 5 seconds from the previous reset.
● CLOCK_PER
If INTEG_TYPE is PERIODIC (5) or PER&DEM (7), a reset is made at the period (sec) set to the CLOCK_PER
parameter.
If the value in CLOCK_PER is smaller than the function block's execution period, bit 1 of BLOCK_ERR "Block
Configuration Error" is set.
A2.6.3 Reset Process
The basic reset process sequence is as follows:
1.) Snapshot
2.) Clearing the integrated values
3.) Reset count increment
4.) Judging OUT_TRIP and OUT_PTRIP (see A2.5)
1.) Snapshot
Saves the following values in the specified parameters before clearing the integrated values. These values will
be retained until the next reset is made.
STOTAL = Total
SRTOTAL = RTotal
SSP = TOTAL_SP
2.) Clearing the integrated values
The reset process clears the Total, ATotal, and RTotal values in the internal registers.
Total = 0
ATotal = 0
RTotal = 0
3.) Reset count increment
Each time a reset is made, the N_RESET parameter will be incremented.
The high limit is 999,999, and if this limit is exceeded, the count returns to "0."