Mitsubishi MELSEC Q Series Programming Manual page 553

Common instruction 1/2

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(a) The device numbers indicated at check conditions (X2 and X8 in the figure below) will

assume index modification values for the individual device numbers (with the exception

of annunciators (F)) described in the ladder patterns.

When corresponding to check condition X2 Processing performed by ...X12

When corresponding to check condition X8 Processing performed by ...X18

However, the order in which failure detection is executed differs depending on whether

SM710 is ON or OFF.

1) If SM710 is OFF, checks will be conducted of coil numbers 1 through the end for

each contact successively.

[Ladder designated by CHKCIR to CHKEND]

X10Z0 X12Z0 Y40Z0 X6Z0

Y5EZ0 X21Z0 Y46Z0 X1AZ0

2) If SM710 is ON, checks will be conducted of contact numbers 1 through the end, in

coil number order.

[Ladder designated by CHKCIR to CHKEND]

X10Z0 X12Z0 Y40Z0 X6Z0

Y5EZ0 X21 Z0 Y46Z0 X1AZ0

in the figure below would be as follows:

[Order of check by CPU module]

Y66 X29 Y4E X22

[Order of check by CPU module]

Y60 X23 Y48 X1C

Y66 X29 Y4E X22

CHKCIR,CHKEND

equivalent to X2

equivalent to X8

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