TMR & CTR Instruction in TI

[mtariq_amin]

Dear All.

I am upgrading 25 year old TI plc to Step7.

The TI PLC is as follows:

5TI Expander



Model: 5TI-5500

Supply Volt: 102-132 VAC 47-63 HZ

Serial # : 15EX8510000491

Full load current: 0.75 A



5TI Sequencer



Model : 5TI-1031-1

Supply Volt : 102-132 VAC 47-63 HZ

Serial # : 81030077

Full load current : 0.75 A


I have the hard copy of TI Program.
I am facing Difficulty in understanding TMR & CTR in TI Program.
The TMR istruction is as follows:

The CTR instruction is as follows:

Kindly help me in finding out, how this timer and counter instruction is working

Which one is on-delay or off-delay timer??
Which one is up or down counter??

Your help regarding this matter will be highly appreciated.

Regards,
Tariq

 

[John Soltesz]

The counters you display are up count only. An up/down counter is a UCD block. See examples below are for 5TI only!
Technicaly there are only on-delay timers in a 5TI. An off-delay is done by using the same NC contact in both inputs to the TMR block. I think the 5TI time in 0.1 seconds, TMR3=5 seconds.
Outputs turn on when preset P is reached in all cases. The UDC output also turns on when the dynamic count =0 when counting down. Additional contacts/rungs are needed to inhibit this. Such as X3 to allow/disallow in another rung. A little confusing at times.
I hope this helps. I had to review one of my 25+ year old manuals.

 

[Ken Moore]

Just to avoid confusion, TI timers and up counters, start at the preset and count down, when the preset equals zero, the output is energized.

 

[mtariq_amin]

Thanx for all your help...

Regards,
Tariq

 

[hbekale]

hello,i want many informations for the functionality of mcr instruction for TI.

 

[jrwb4gbm]

hello,i want many informations for the functionality of mcr instruction for TI.

See page 6-70 in manual in link below:
https://support.industry.siemens.com/cs/attachments/17517059/505-8104-5.pdf

 

[Eriond]

OMG!! You have a system being controlled by a 5TI?? Are you still wheeling around that HUGE programming unit? That is astounding!