ELC Programming Manual
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3-20
HOUR ELC-PC/PA/PH Models
4. These instructions can only be used eight times in a program:
TTMR ELC-PC/PA/PH, ELCM-PH/PA Models
5. The DHSCS and DHSCR instructions can only be executed simultaneously a maximum of
three times in the program for ELC-PB, ELCB-PB models.
6. The DHSCS, DHSCR and DHSZ instructions can only be executed simultaneously a
maximum of five times in the program for ELC-PC/PA/PH models.
7. For counters C232~C242, the maximum number of times DHSCS, DHSCR and DHSZ
instructions can be used in a program is 6. DHSZ can only be used a maximum of 5 times in a
program for ELCM-PH/PA models.
8. For counters C243, C245~C248, C251, C252, the maximum number of DHSCS, DHSCR and
DHSZ instructions can be used in a program is 4. DHSZ takes up 2 times of the total available
number of times this instruction can be used in a program for ELCM-PH/PA models.
9. For counters C244, C249, C250, C253, C254, the maximum number of times DHSCS,
DHSCR and DHSZ instructions can be used in a program is 4. DHSZ takes up 2 times of the
total available number of times this instruction can be used in a program for ELCM-PH/PA
models.
10. Limitations on executing the same instruction multiple times
There is no limitation on the number of times an instructions listed below may be used in a program.
But there are limitations on how many occurances of the same instruction that can be
simultaneously executed. in the program.
1. Instructions which can be executed only once: API 52 MTR (ELC-PC), API 56 SPD
(ELC-PB/PC), API 69 SORT (ELC-PC), API 70 TKY (ELC-PC), API 71 HKY (ELC-PC), API 72
DSW (ELC-PC), API 74 SEGL (ELC-PC), API 75 ARWS, API 80 RS (ELC-PB/PC), API 100
MODRD (ELC-PB/PC), API 101 MODWR (ELC-PB/PC), API 102 FWD (ELC-PB/PC), API 103
REV (ELC-PB/PC), API 104 STOP (ELC-PB/PC), API 105 RDST (ELC-PB/PC), API 106
RSTEF (ELC-PB/PC), API 150 MODRW (ELC-PB/PC).
2. Instructions which can be executed only twice: API 58 PWM (ELC-PC), API 59 PLSR
(ELC-PC).
3. Instructions which can be executed only 4 times: API 57 PLSY (ELC-PV), API 58 PWM
(ELC-PV).
4. In ELC-PC series, there is on limitation on the times of using the high-speed output instructions
PLSY, PWM and PLSR, bit only one high-speed output instruction will be enabled in every
scan.
5. In ELC-PV series, there is no limitation on the times of using hardware high-speed counter
instructions DHSCS, DHSCR and DHSZ, but when the three instructions are enabled at the
same time, DHSCS will occupy 1 memory unit, DHSCR 1 memory unit, and DHSZ 2 memory
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