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8-12

Ladder Logic (LAD) for S7-300 and S7-400

C79000-G7076-C504-02

8.11 Up Counter Coil

The Up Counter Coil (CU) instruction increments the value of a specified

counter by one if the RLO has a positive edge (that is, a transition from 0 to 1

takes place in the RLO) and the value of the counter is less than 999. If the

RLO does not have a positive edge, or if the counter is already at 999, the

value of the counter does not change.

The Set Counter Value instruction sets the value of the counter (see

Section 8.10).

Table 8-10 Up Counter Coil Element and Parameter, with SIMATIC and International Short Name

LAD Element Parameter Data Type Memory Area Description

Counter

number

COUNTER C The address indicates the number of

the counter that is to be incremented.

Status Word Bits

BR CC 1 CC 0 OV OS OR STA RLO FC

Write – – – – – 0 – – 0

I 0.0 C 10

If the signal state of input I 0.0 changes from

0 to 1 (that is, if there is a positive edge in the

RLO), the value of counter C 10 is

incremented by 1 (unless the value of C 10 is

equal to 999).

If there is not a positive edge, the value of

C 10 remains unchanged.

Figure 8-10 Up Counter Coil

Description

Bit Logic Instructions

1 2 ... 105 106 107 108 109 110 111 112 113 114 115 ... 317 318

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