Mitsubishi MELSEC Q Series Programming Manual page 352

Common instruction 1/2

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Counter 2-phase input up or down (UDCNT2)

(1) The present value of the counter designated by

input designated by

phase pulse).

(2) Direction of the count is determined in the following manner:

are added to the present value of the counter).

are subtracted from the present value of the counter).

• No count operation is performed if

(3) Count processing is conducted as described below:

• When the count is going up, the counter contact designated at

present value becomes identical with the setting value designated by n. However, the

present value count will continue even when the contact of the counter designated at

goes ON. (See Program Example (1))

• When the count is going down, the counter for the contact designated at

when the present value reaches the set value

+ 0: Input number for count input (A phase pulse) (bits)

+ 1: Input number for count input (B phase pulse) (bits)

: Number of the counter to be enabled to start counting with the UDCNT2 instruction (Device name)

n : Value to set (BIN 16 bits)

Internal Devices

*1: Only the X device can be used for

(A phase pulse) and the status of the input designated by

+1 goes from OFF to ON, count up operation is performed (values

+1 goes from ON to OFF, count down operation is performed (values

. However, the X device can be used only in the range of number of I/O points

(the number of accessible points to actual I/O modules).

*2: Local devices and the file registers set for individual programs cannot be used.

is updated depending on the status of the

1. (See Program Example (1))

goes ON when the

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