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Showing results 1 to 25 of 417
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Search: Posts Made By: Pete.S.
Forum: LIVE PLC Questions And Answers Today, 03:33 PM
Replies: 8
Views: 90
Posted By Pete.S.
That's great Mike! VAR CONSTANT looks like...

That's great Mike!

VAR CONSTANT looks like it's the replacement for const.

But the AT command hasn't the same function anymore. You just used it as a name.

The purpose of the AT is to...
Forum: LIVE PLC Questions And Answers Today, 02:29 PM
Replies: 8
Views: 90
Posted By Pete.S.
S7-1500 SCL, TIA V14 versus Classic

Hi guys!

Is there a document somewhere that states the difference between SCL in TIA portal versus SCL in classic Step7?

I want to reuse some code from old projects into the TIA portal but I...
Forum: LIVE PLC Questions And Answers February 18th, 2018, 06:06 PM
Replies: 5
Views: 145
Posted By Pete.S.
Haha, well you're absolutely right. :doh2: ...

Haha, well you're absolutely right. :doh2:

I'll shut up about the S7-300 now. It looks like I was the one that was confused. :beerchug:
Forum: LIVE PLC Questions And Answers February 18th, 2018, 04:54 PM
Replies: 5
Views: 145
Posted By Pete.S.
On the S7-300 side there is confusion for sure....

On the S7-300 side there is confusion for sure. Siemens says you need a memory card but you don't.

As proof I've attached two photos from my phone showing an CPU314 and CPU315-2DP running in...
Forum: LIVE PLC Questions And Answers February 18th, 2018, 03:41 PM
Replies: 13
Views: 315
Posted By Pete.S.
If you buy a VFD made for single phase operation...

If you buy a VFD made for single phase operation you don't need to derate anything.
At least not the ones I've seen. For ABB inverters I'm sure of it.

PS. A lot of metal lathes have the motor...
Forum: LIVE PLC Questions And Answers February 18th, 2018, 03:35 PM
Replies: 5
Views: 145
Posted By Pete.S.
Does the S7-1500 NEED memory card?

Hi guys!

Is the memory card a must on the Simatic S7-1500?

At least the newer S7-300s could be run without a card even though some info on the net says that you must have one.

How is it with...
Forum: LIVE PLC Questions And Answers February 11th, 2018, 10:20 AM
Replies: 15
Views: 479
Posted By Pete.S.
The alternative to the FIFO buffer is called a...

The alternative to the FIFO buffer is called a ring buffer or circular buffer.

It's much faster to execute for the CPU so it's the standard type of buffer for almost everything that has a CPU...
Forum: LIVE PLC Questions And Answers February 2nd, 2018, 07:56 PM
Replies: 10
Views: 324
Posted By Pete.S.
It's not complicated. Two things to think...

It's not complicated.

Two things to think about:

1) The production line safety plc should have a safe output that goes to the safe input of the OEM machine.

As long as the E-stop on the...
Forum: LIVE PLC Questions And Answers February 1st, 2018, 05:20 PM
Replies: 10
Views: 333
Posted By Pete.S.
Yes, it's possible to set it up like that. Do you...

Yes, it's possible to set it up like that. Do you think that will be an advantage?
Forum: LIVE PLC Questions And Answers February 1st, 2018, 05:18 PM
Replies: 10
Views: 333
Posted By Pete.S.
S7-1500 has a block called MB_SERVER that you...

S7-1500 has a block called MB_SERVER that you should put in OB1. So it's called every scan.

I'll check out the communication load option.
Forum: LIVE PLC Questions And Answers February 1st, 2018, 11:56 AM
Replies: 10
Views: 333
Posted By Pete.S.
S7-1500 modbus tcp speed?

Hi guys!

I was wondering if there is a way to speed up the modbus tcp server in the S7-1500?

I'm talking about the time it takes from a request is received in the S7-1500 (the modbus server) to...
Forum: LIVE PLC Questions And Answers January 21st, 2018, 10:27 AM
Replies: 25
Views: 813
Posted By Pete.S.
I normally set my s7-300 projects to symbolic...

I normally set my s7-300 projects to symbolic mode. Does the s7-1500 symbolic mode work the same way?
Forum: LIVE PLC Questions And Answers January 21st, 2018, 05:48 AM
Replies: 25
Views: 813
Posted By Pete.S.
Using TIA portal instead of classic step 7

I have for the longest time avoided using the S7-1500 because everyone warned me that TIA portal was a stinking pile of garbage to be avoided at all cost.

Unfortunately I can no longer do that as...
Forum: LIVE PLC Questions And Answers January 14th, 2018, 07:08 PM
Replies: 2
Views: 251
Posted By Pete.S.
I've build simulations in the past where every...

I've build simulations in the past where every sensor and material flow and everything else was completely simulated and connected to real systems.

It's very easy to make a mistake. Customers I...
Forum: LIVE PLC Questions And Answers January 6th, 2018, 10:04 PM
Replies: 16
Views: 647
Posted By Pete.S.
It should not be done in the HMI. You...

It should not be done in the HMI.

You should set a bit from the HMI that triggers a little sequence in the PLC or motion controller that does what you want.

You would not use wait in the PLC...
Forum: LIVE PLC Questions And Answers January 6th, 2018, 09:49 PM
Replies: 7
Views: 421
Posted By Pete.S.
Script could also mean structured text in the PLC...

Script could also mean structured text in the PLC - aka SCL (Structured Control Language) in Siemens.
Forum: LIVE PLC Questions And Answers January 5th, 2018, 08:18 PM
Replies: 14
Views: 638
Posted By Pete.S.
misread the OP's question which has been answered...

misread the OP's question which has been answered - deleted post
Forum: LIVE PLC Questions And Answers January 1st, 2018, 06:27 PM
Replies: 17
Views: 622
Posted By Pete.S.
3-phase brake is a standard option on larger...

3-phase brake is a standard option on larger 3-phase AC induction motors.

Look at ABB for instance...
Forum: LIVE PLC Questions And Answers January 1st, 2018, 03:29 PM
Replies: 17
Views: 622
Posted By Pete.S.
I think it's pretty clear. In the drawing...

I think it's pretty clear.

In the drawing with the emerson drive the brake is a three phase magnetic brake. The inverter drives the first relay which drives the contactor which energizes the brake...
Forum: LIVE PLC Questions And Answers December 31st, 2017, 08:41 PM
Replies: 43
Views: 1,824
Posted By Pete.S.
Good choice but you might need a larger drive...

Good choice but you might need a larger drive too. SSD if you don't have one - makes a big difference.

Count on using about 60GB for every win 7 installation. I usually count 100GB per VM that...
Forum: LIVE PLC Questions And Answers December 31st, 2017, 08:34 PM
Replies: 9
Views: 562
Posted By Pete.S.
You need to research the company and that plant....

You need to research the company and that plant. What type of systems are they running for instance? Find out if there has been anything written about them in the newspapers. Do you know anybody...
Forum: LIVE PLC Questions And Answers December 30th, 2017, 04:35 PM
Replies: 43
Views: 1,824
Posted By Pete.S.
If you really need a real serial port you might...

If you really need a real serial port you might want to rethink your VM approach. Most VMs don't have access to the real hardware because they run virtualized. Hardware passthrough is an option but...
Forum: LIVE PLC Questions And Answers December 30th, 2017, 09:01 AM
Replies: 7
Views: 377
Posted By Pete.S.
Yes, individual virtual lamps for the I/O and...

Yes, individual virtual lamps for the I/O and show analog I/O in engineering units, % or mA. Whatever makes the most sense.

The goal should be to be able to provide enough information to diagnose...
Forum: LIVE PLC Questions And Answers December 29th, 2017, 04:56 PM
Replies: 43
Views: 1,824
Posted By Pete.S.
That's a good point! I forgot all about that even...

That's a good point! I forgot all about that even if I did that myself not that many years ago. I had a smaller card with a special cable that had the 9-pin d-sub on the other end.

Good thing was...
Forum: LIVE PLC Questions And Answers December 29th, 2017, 04:40 PM
Replies: 43
Views: 1,824
Posted By Pete.S.
USB or ethernet to serial can't get the same...

USB or ethernet to serial can't get the same tight timing as you can with a standard serial port. It's especially true for application using the control signals on the port (CTS/RTS/DCD etc). I think...
Showing results 1 to 25 of 417

 
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