DVP-ES2-EX2-SS2-SA2-SX2-Operation Manual

DVP-ES2/EX2/SS2/SA2/SX2/SE Operation Manual - Programming
API Mnemonic Operands Function
51 REFF P Refresh and Filter Adjust
Controllers
ES2/EX2 SS2 SA2
SE SX2
Type Bit Devices Word devices Program Steps
OP X Y M S K H KnX KnY KnM KnS T C D E F REFF, REFFP: 3 steps
n * *
Operands:
n: Response time (unit: ms)
PULSE 16-bit 32-bit
SA2
SA2
SA2
ES2/EX2 SS2 SX2 ES2/EX2 SS2 SX2 ES2/EX2 SS2
SE
SE
SE
Explanation:
1. PLC provides digital input filters to avoid interference. The response time (n) of X0 ~ X7 input
filters can be adjusted by REFF instruction. The instruction sets the value specified in n to
D1020 (X0 ~ X7 input filter time) directly.
2. When PLC turns from OFF to ON or the END instruction is reached, the response time is
dictated by the value of D1020.
3. During program execution, the value in D1020 can be changed by using MOV instruction.
4. When using REFF instruction during program execution, the modified response time will be
move to D1020 and refreshed until next program scan..
5. Range of n: = K2 ~ K20.
Program Example:
1. When the power of PLC turns from OFF to ON, the response time of X0~X7 inputs is
specified by the value in D1020.
2. When X20 = ON, REFF K5 instruction is executed, response time changes to 5 ms and takes
affect the next scan.
3. When X20 = OFF, the REFF instruction will not be executed, the response time changes to
20ms and takes affect the next scan.
SX2
X20
X0
X20
X1
REFF
Y1
REFF
Y2
K5
K20
END
Points to note:
Response time is ignored (no delay) when input points are occupied by external interrupts,
high-speed counters or SPD instruction.
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