Delta-electronics Extension Digital I/O Module DOP-EXIO14RAE Manual de usuario descargar pdf (Pagina 139)

Appendix D Use of Application Instructions|DOP-EXIO Series

D-58

Revision March, 2008, Doc. Name: 2007PDD23000014

Mnemonic Operands Function

REF

Refresh

Bit Devices Word Devices

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

 

y Note:

1. D must designate X0, X10, Y0, Y10…the points whose 1s digit is “0”.

See remarks for more details.

2. Range of n: 8 ~ 256 (has to be the multiple of 8).

16-bit instruction (5 Steps)

REF

Continuous

execution

32-bit instruction

- - - -

y Flags: None

Operands:

: Start device to be I/O refreshed

: Number of items to be I/O refreshed

Explanations:

1. The status of all input/output terminals of DOP-EXIO series will be updated after the program

scans to END. When the program starts to scan, the status of the external input terminal is read

and stored into the memory of the input point. The output terminal will send the content in the

output memory to the output device after END instruction is executed. Therefore, this instruction

is applicable when the latest input/output data are needed for the operation.

2. REF command can be used between FOR and NEXT instruction, and between CJ instructions.

If there is an interrupt occurs in the period of time when input/output terminals is working, REF

command can also be used. It can be also used to interrupt the subroutine program.

3. The operand

D should always be a multiple of 10, i.e. 00, 10, 20, 30… etc., so it should be X0,

X10, Y0, Y10… etc. The operand

n hould always be a multiple of 8, i.e. 8, 16, 24, 32…etc. and

its available range is 8~256. If the value of

n is out of the stated range (8~256) or not a multiple

of 8, an “operation error” will be generated.

Program Example 1:

When X0 = On, DOP-EXIO series will read the status of input points X0 ~ X7 immediately and refresh

the input signals without any input delay.

REF X0

K16

Program Example 2:

When X0 = On, the 8 output signal from Y0 ~ Y7 will be sent to output terminals and refreshed. But

there is 10ms input delay occurred on the input signals.

REF Y0

1 2 ... 134 135 136 137 138 139 140 141 142 143 144 ... 156 157

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