PLC STEP 7 Program -- 2
€30-250 EUR
Paid on delivery
I am looking for a freelancer who can create a PLC STEP 7 program using Ladder Logic. The program needs to be integrated in an existing Siemens PLCs project, and replace this function.
Hot Fluid Pump Control
We have a motor pump, controlled by a SINAMICS G120C inverters, that pumps a hot fluid (glycol) thru a circuit of several tanks for heating.
Each tank has a Temperature PID (with output configured to PWM) to control a valve that includes the tank in the previous circuit (valve on - receives hot glycol) or excludes from that circuit (valve off – no heating).
(see diagram in attached file)
Current Implementation:
The current (working) implementation of this system is a set of STEP 7 Organization Block (for SIEMENS S7-1500 PLC) that controls the velocity of the motor (TO_SpeedAxis using MC_Power, MC_Reset, MC_Halt and MC_MOVEVELOCITY) depending on the number of “Opened” valves (tank is receiving heat from the circuid).
We define in a Data Block the desired velocity for 3 levels of operation (low, medium and high) and the corresponding number of opened valves.
So, for example, if we define:
• Low operation:
o Number of opened valves: 1
o Velocity: 1000 r/min
• Medium operation:
o Number of opened valves: 3
o Velocity: 1500 r/min
• High operation:
o Number of opened valves: 5
o Velocity: 2000 r/min
If the number of opened valves (number of tanks heating) is 0, the velocity of the pump is set to 0 (for security) but then if one valve opens, the velocity of the pump is set to 1000 r/min, after a while 2 more valves open (3 in total), the velocity goes up to 1500. If one closes (2 in total) the velocity goes back to 1000 r/min…
At any moment any of the valves, controlled by an independent PID, can open or closes, so this evaluation is made in real-time.
We also have a pressure sensor in the circuit and, if for any reason the pressure goes up to 2 bar, the pump is halted (MC_Halt) and the velocity goes slowly to 0 and an alarm is generated (stored in an DB).
Desired Implementation:
We want to control the velocity of the pump only by the pressure of the heating fluid that the pump originates, not by the number of the tanks that are heating in a given moment.
Let’s say that the desired fluid pressure in the circuit is 1 bar. The velocity of the motor should go up and down to maintain that pressure. If the pressure of the fluid goes above 1 bar, the pump should reduce the velocity, if the pressure of the fluid goes below 1 bar, the pump should increase it’s velocity.
We want to maintain 2 fail safes in this design:
1. If all the tanks have their valves closed
2. If the pressure goes over the maximum security value (say 2 bar)
In either of this cases, the motor should be halted. In the second case, an alarm should be registered.
Project ID: #37276244
About the project
Awarded to:
A competent professional with 13 years of experience in Industrial Automation. Development of Engineering and implementation of PLC Control System, HMI and SCADA Development, testing & commissioning. ◾ PLC- Siemens- More
16 freelancers are bidding on average €198 for this job
I have big experience with S7 PLCs, I could help you with that project to add new functions to your current project.
Dear, I can write proper code for You, I have experience and knowledge with Siemens in Dairy industrial. Please chat if You are interested. BR Marcin
Hello sir I read the job you want to do it I have Tia portal version form 13to17 and I am ready for work I have good experience Siemens PLC and sinamics drive and I do jobs using If you contact me I will send you the More
We are a team of Electrical and Electronics engineers, we have successfully completed 1000+ Projects for multiple regular clients from OMAN, UK, USA, Australia, Canada, France, Germany, Lebanon and many other countries More
Hi, I have extensive experience in programming PLCs using Ladder Logic and integrating them into existing Siemens PLC projects. I understand the technical challenge of replacing the existing Hot Fluid Pump Control fun More
Hello Hope everything is well with you.I read your job description and I'm able to do it.I'm an instrumentation and control engineer with relevant experience in the field of Plc. Let's discuss more details
Subject: Proposal for PLC Project Dear Sir, I hope this message finds you well. I am writing to express my interest in your Siemens S7-1200 PLC programming project, as advertised. I have extensive experience working wi More
Dear customer, Kindly please order this project for me. I have experience in PLC and SCADA Programming. Thank you advance. Best Regard, Suratman.
I think PLC programming will be done almost in your current implementation after some changes. Time will take only for SCADA implementation.
