The lamp lights up even though the bit in the lamp device memory is not ON.

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  • No : 4735
  • Displayed Date : 2025/12/01 13:51
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The lamp lights up even though the bit in the lamp device memory is not ON.

The lamp lights up even though the bit in the lamp device memory is not ON.

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Answer

<Cause>

The lamp device memory is used redundantly.

 

<Solution>

Check if the same address as the lamp device memory is used in the screen data or in the PLC program.
Depending on the value set for [No. of Patterns], the number of device memory addresses used will vary. Check the availability of these device memory addresses.

 

Example: When five lamps (No. of Patterns: 3) are configured consecutively from lamp device memory M0000 (bit):

V-SFT Ver.6


V-SFT Ver.5
 
　OFF　　　　ON　　　　P3
 
     Wrong　　　　　　          Correct
 
When "3" is set for [No. of Patterns], 2 bits are used.

L1 (M0000/M0001)
L2 (M0002/M0003)
L3 (M0004/M0005)
L4 (M0006/M0007)
L5 (M0008/M0009)

As the number of patterns is increased, the number of bits used is also increased.

 

L1 lamp example:

OFF display  M0000 : OFF, M0001 : OFF
ON display   M0000 : ON, M0001 : OFF
P3 display*  M0000 : OFF, M0001 : ON

* Since the higher bits have priority, P3 display is shown when M0001 is ON.

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