Delta DVP-ES2/EX2/SS2/SA2/SX2/SE manual KnX KnY KnM KnS T REF, Refp 5 steps

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

API Mnemonic Operands Function Controllers

50	REF			P		Refresh				SA2
										ES2/EX2 SS2 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 REF, REFP: 5 steps
D	*	*
n					*	*

	PULSE				16-bit				32-bit
ES2/EX2	SS2	SA2	SX2	ES2/EX2	SS2	SA2	SX2	ES2/EX2	SS2	SA2	SX2
		SE				SE				SE

Operands:

D: Start device for I/O refresh n: Number of devices for I/O refresh

Explanations:

1.PLC updates I/O status between END instruction and the start of next program scan. If an immediate I/O refresh is needed, REF can be applied for performing I/O refresh immediately.

2.D can only be a multiple of 10, i.e. X0 or Y0, and the instruction is NOT applicable for I/O points on DIO modules.

3.Only the I/O points on MPU can be specified for operand D for I/O refresh.

z When D specifies X0 and n ≦ 8, only X0~X7 will be refreshed. If n > 8, all I/O points on MPU will be refreshed.

z When D specifies Y0 and n = 8, only Y0~X7 will be refreshed. If n > 8, all I/O points on MPU will be refreshed.

z When D specifies X10 or Y10, I/O points on MPU except for X0~X7 or Y0~Y3 will all be refreshed regardless of n value, i.e. only status of X0~X7 or Y0~Y3 remains.

4.For EX2/SX2 MPU only: If M1180 = ON and REF instruction executes, PLC will read the A/D value and update the read value to D1110~D1113. If M1181 = ON and REF instruction executes, PLC will output the D/A value in D1116 and D1117 immediately. When A/D or D/A values are refreshed, PLC will reset M1180 or M1181 automatically.

5.Range for n (ES2/EX2): 4 ~ total I/O points on MPU. n should always be a multiple of 4.

6.Range for n (SS2/SA2/SE/SX2): 8 ~ total I/O points on MPU.

Program Example 1:

When X0 = ON, PLC will refresh the status of input points X0 ~ X7 immediately without delay.

X0

REF X0 K8

Program Example 2:

When X0 = ON, the 4 output signals on Y0 ~ Y3 will be sent to output terminals immediately before the program proceeds to END instruction.

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