Delta DVP-SS2 User Manual

DVP-ES2/EX2/EC5/SS2/SA2/SX2/SE&TP Operation Manual - Programming
2-54
Y0
X1
P2CALL
X0
Y1
P**
20
P2
FEND
Y1
SRET
24
(subroutine
P2)
subroutine
Call subroutine P**
subroutine return
Interrupt pointer I: used with application instruction API 04 EI, API 05 DI, API 03 IRET. There are
four types of interruption pointers. To insert an interruption, users need to combine EI (enable
interruption), DI (disable interruption) and IRET (interruption return) instructions.
When the instruction EI is enabled, the PLC will check if there is any interrupt that need to be done
everytime an instruction is executed. If an interrupt is found, the PLC will stop executing the
instruction and execute the interrupt first. If no interrupt is found, the PLC will keep executing the
instruction. From the explanation, we can conclude that the maximum waiting time for an interrupt
to be executed is the execution time of an instruction.
One instruction
executing time
One instruction
executing time
Check interrupt
One instruction
executing time
Interrupt
sub-routine
Interrupt occurred
IRET
One instruction
executing time
Check interrupt
EI
1. External interrupt
 When input signal of input terminal X0~X7 is triggered on rising-edge or falling-edge, it will
interrupt current program execution and jump to the designated interrupt subroutine pointer
I000/I001(X0), I100/I101(X1), I200/I201(X2), I300/I301(X3), I400/I401(X4), I500/I501(X5),
I600/I601(X6), I700/I701(X7). When IRET instruction is executed, program execution
returns to the address before interrupt occurs.
 When X0 (C243) works with I100/I101 (X1), X0/X1 (C246, C248, C252) works with
I400/I401, the value of C243, C246, C248, C252 will be stored in (D1240, D1241)
 When X2 (C244) works with I300/I301 (X3), X2/X3 (C250, C254) works with I500/I501, the
value of C244, C250, C254 will be stored in (D1242, D1243).
2. Timer interrupt
PLC automatically interrupts the currently executed program every a fixed period of time
(2ms~99ms or 0.5ms~9.9ms) and jumps to the execution of a designated interruption
subroutine
3. Counter interrupt
The high-speed counter comparison instruction API 53 DHSCS can designate that when the
comparison reaches the target, the currently executed program will be interrupted and jump to
the designated interruption subrountine executing the interruption pointers I010, I020, I030,
I040, I050 ,I060, I070, I080.

Delta DVP-SS2 Specifications

General

Brand	Delta
Model	DVP-SS2
Category	Controller
Language	English