proximity switch siemens logo help

[heyho]

Hi all,
First, thank you for reading the thread. So I had a task as the following:
An up-counter must be programmed as part of a batch-counting operation to sort parts automatically for quality control. The counter is installed to divert 1 part out of every 8 for quality control or inspection purposes.
The circuit operates as follows:
When the Start ‘push to make’ (not toggle) switch (I1) is pressed/released, and gets latched on (B1: RS latch), the main conveyor line (Q1) will be energised, and parts will start to pass the proximity switch (B2) every 2 s
The pulses generated by the proximity switch (B2: pulse generator) should be used to increment the quality check counter (B3). When the B3 = 4, the conveyor gate solenoid (Q2) will then activate for 1.5 s and the quality line conveyor (Q3) will run for 4 s to take a sample object
The gate Q2 returns to its normal position when the 1.5 s time period ends, and the counter also resets back from 4 to 0. The main line Q1 does not stop (unless the stop is pressed)
The process is repeated with a sample taken at every 4 object counts
A reset ‘push to make’ (not toggle) switch (I2) is provided to reset the counter manually but not to stop the process.
A stop ‘push to make’ (not toggle) switch (I3) is provided to stop the process at any time.
The process should automatically reset and repeat until the stop switch is pressed.

So here is what I have done:


And this was the feedback I got:
2 Your program should have push-to-make switches not toggle type. Proximity switches are not actual switches in the simulation - reread program instructions. Once the start is pressed the conveyor system should run automatically with no further intervention.

So I already changed everything to push to make switches but I'm having hard time with the proximity switches?
Anyone has got any idea?
Please help if you have a minute of your life.
Thanks

 

[drbitboy]

[...]
When the Start ‘push to make’ (not toggle) switch (I1) is pressed/released, and gets latched on (B1: RS latch), the main conveyor line (Q1) will be energised, and parts will start to pass the proximity switch (B2) every 2 s

[...]

Proximity switches are not actual switches in the simulation - reread program instructions. Once the start is pressed the conveyor system should run automatically with no further intervention.

Your program requires you to use I2 to manually simulate proximity sensor events.

I think that feedback, and the original problem description, is saying you the program itself needs to simulate one proximity sensor event once every 2s.

 

[heyho]

Thank you for your answer. Much appreciated. I managed to modify it.

 

[heyho]

Would you mind to help me with another question?
A steel company is planning to automate various parts of its factory. One application is a simple automation of specific machines such as bar cutting with up to 10 I/Os, while the other application relates to a material sorting and handling conveyor system, that can support 4 cutting disk stations (1 station is shown below).
Considering unitary, and modular PLCs, you have been asked to select a real commercial PLC of each type that would be suitable each application and describe the following:
An appropriate real network configuration diagram that connects 4 cutting disk station PLCs together to an overall conveyor. Also draw the field devices for at least 1 cutting disk PLC and the conveyor PLC and describe the communication links used.

So my drawing was like this:

And the feedback I had is that:
, also your network needs to relate to a real/commercial network to prove your design will work

I really don't get what he wants me to do. I mean how am I supposed to get a real network to prove my design.
This is the guidance I had as well:
) should include an appropriate commercial network example suitable for the selected PLCs
Any idea?

 

[Steve Bailey]

I believe your instructor wants you to specify the brand and model of PLC and the network protocol in use over the ethernet cable. So nice to see that the HNC bureaucrats haven't given up their fixation with the 'unitary' and 'modular' terminology. Also glad to see they have abandoned 'rack mounted'. Those of us with long memories fondly recall the early days of this forum when hordes of HNC students would ask for help answering questions about the proper deployment of unitary, modular, and rack mounted PLCs.

 

[Puddle]

Saying that Ethernet/IP is the most common protocol is a very bold statement. I'd argue that Modbus is the most common. In the UK you're more likely to be working on Siemens equipment rather than Allen Bradley, which uses Profinet.

Realistically, I would be specifying a single PLC and four remote IO stations, but I don't think that's what the assignment wants. If there's an emergency stop going to each of the four cutting disc PLCs, use a failsafe/safety CPU.
Conveyor PLC: Siemens 1511F-1
Cutting blade PLCs: Siemens 1212F with SM 1226 F-DI and F-DQ modules. Onboard IO will do everything except the emergency stop, which requires both input and output modules to function properly.
To get the network topology that's specified, you'll also need an XB005 unmanaged switch as the most basic option, or specify something like an SC636-2C which is for industrial cyber security.

 

[heyho]

I believe your instructor wants you to specify the brand and model of PLC and the network protocol in use over the ethernet cable. So nice to see that the HNC bureaucrats haven't given up their fixation with the 'unitary' and 'modular' terminology. Also glad to see they have abandoned 'rack mounted'. Those of us with long memories fondly recall the early days of this forum when hordes of HNC students would ask for help answering questions about the proper deployment of unitary, modular, and rack mounted PLCs.

I have specified the specific plcs that I could think of with my limited knowledge on PLCs. I only posted here to get some guidance and not to get the task to be worked out. I have no previous study of any PLC and I was pushed into Level 4 (HNC in the UK) straight away. This unit is part of the HNC course and I couldn't change it. I have been working in a manufacturing environment for nearly 14 years but my primary focus (and my previous studies) is mechanical engineering and my course in Manufacturing engineering. I know for the fact that without the appropriate electrical qualification you're not allowed to open even an electrical panel on our shop floor, and even then, is just checking field wiring, is the reading there?, then plc out and new one in. Anything complicated goes to CSS team (Control System Specialist) to have a look at coding side. So I'm not planning to use any of the plc "knowledge" I gather in this course in the future I came to this site for guidance only.

 

[heyho]

Saying that Ethernet/IP is the most common protocol is a very bold statement. I'd argue that Modbus is the most common. In the UK you're more likely to be working on Siemens equipment rather than Allen Bradley, which uses Profinet.

Realistically, I would be specifying a single PLC and four remote IO stations, but I don't think that's what the assignment wants. If there's an emergency stop going to each of the four cutting disc PLCs, use a failsafe/safety CPU.
Conveyor PLC: Siemens 1511F-1
Cutting blade PLCs: Siemens 1212F with SM 1226 F-DI and F-DQ modules. Onboard IO will do everything except the emergency stop, which requires both input and output modules to function properly.
To get the network topology that's specified, you'll also need an XB005 unmanaged switch as the most basic option, or specify something like an SC636-2C which is for industrial cyber security.

I know it's a bold statement, please read my previous comment.
Thank you for your answer. However, I went as the following:
Cutting station: Siemens Simatic S7-1200 range (1211C) What do you think? Would that be suitable?
Conveyor system: I picked CompactLogix 5380 What do you think?
I was mainly interested in how to get commercial network example for the plcs. I mean, the instructor specified that a real one to prove my hypothetical system works. How I ask? I really don't get it