Mitsubishi Time comparison istruction

[Amol Kirad]

hi all,

I am facing problem for the time comprision  in PLC logic.

I want to do shift counting but for 8 hours and their timings are 

A shift 8:31 to 16:30

B shift 16:31 to 0:30

c shift 0:31 to 8:30

Help me for this.

I want to compare against RTC of PLC .

RTC has been read using DATERD function of PLC.

[Ron_S]

If A shift register1 = 8 and A shift register 2 = 31 then action.

And so on

But one word of warning, the plc clock is not very accurate and will drift way off over time.

[Amol Kirad]

Yes.Time will vary accordingly but my concern is that I am not able to use the inbuilt instruction of Mitsubishi PLC of time comparison.

It is not working well and not giving proper output.

Please go through images I need comparison fro Hour and Minute.

my requirement is just 

[[[ Actual time(hour and Minute)  >  Set time(min)            '' & ''  Actual time(hour and Minute)  <  Set time(max)   ]]] -------------------------------------(M1000) on

ex...... [[[[                   8 : 45 > 8 : 30   '' & ''         8 : 45 < 16 : 30                     ]]]] -----------------------------------(M1000) ON.

I want to excute this condition in ladder of mistubishi PLC usnig  TM>= instruction.

 

[aakash]

the datered logic ;  they have different memory   for hour and minutes ,you have to use them seperately in program

 

check the previous forum already been discussed

Edited December 7, 2016 by aakash

[Amol Kirad]

• well if I use them then it's not going to give me an  unregulated result with normal comparison instruction. 

[Amol Kirad]

Dear akash,

which forum you are talking about ?

[aakash]

there is one in download section check it