Mitsubishi Digital Electronics QnUCPU Manual

A SERVICE OF

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App - 50

(2) Method of avoiding “OPERATION ERROR” (error code: 4140) in the floating-point data

comparison instructions

As shown in the modification examples below, connect the contacts of valid data flag in series for each floating-

point data comparison instruction. (Use AND connection for connecting the contact of the valid data flag and the

floating-point data comparison instruction.)

Make sure that there is no line (OR connection) between the valid data flag and the floating-point data compari-

son instruction.

<Modification example 1>

<Modification example 2>

(Before modification) (After modification)

E<= D100 E10

E>=

D100 E200

E<= D100 E10

E>=

D100 E200

Valid

data

flag

Valid

data

flag

Valid

data

flag

Make sure that there is no line (OR connection)

between the signal which shows the

floating-point data validity (valid data flag) and

the floating-point data comparison instruction.

(Before modification)

(After modification)

E<= E10D100 E<= D100 E10

M200 M201 M200 M201

Valid

data

flag

Valid

data

flag

Valid

data

flag