Delta DVP-ES2 User Manual download pdf (Page 236)

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101

DVP-ES2/EX2/SS2/SA2/SX2/SE Operation Manual - Programming

3-120

API Mnemonic Operands Function

REFF P

Refresh and Filter Adjust

Controllers

ES2/EX2 SS2

SA2

SX2

Bit Devices Word devices Program Steps Type

X Y M S K H KnX KnY KnM KnS T C D E F

* *

REFF, REFFP: 3 steps

PULSE 16-bit 32-bit

ES2/EX2 SS2

SA2

SX2 ES2/EX2 SS2

SA2

SX2 ES2/EX2 SS2

SA2

SX2

Operands:

n: Response time (unit: ms)

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.

X20

REFF K5

X20

REFF 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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Delta DVP-ES2 User Manual Page 236

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