IM 01C25T02-01E
A-17
Appendix 2. Integrator (IT) Block
A2.6 Reset
A2.6.1 Reset Trigger
There are the following five types of reset triggers:
1. An integrated value exceeds TOTAL_SP.
2. An integrated value falls below "0."
3. RESET_IN is "H."
4. Every period specified in CLOCK_PER (for more information, see CLOCK_PER in A2.6.2)
5. OP_CMD_INT is 1.
The table A2.2 shows the correlation between INTEG_TYPE and RESET triggers.
Table A2.2 RESET Triggers
(1) (2) (3) (4) (5)
1:UP_AUTO
2:UP_DEM
3:DN_AUTO
4:DN_DEMO
5:PERIODIC
6:DEMAND
7:PER&DEM
TA 0205.EPS
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.
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