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Siemens Step 7 programming QUESTION

Siemens Step 7 programming QUESTION

Siemens Step 7 programming QUESTION

(OP)
Hi guys, I am new with PLC programming so I want your lights.. We suppose to install a flowmeter( with analog current output 4-20mA), after an on/off solenoid valve. Connecting the flowmeter to AI module I will get indication in SCADA for the flow. My question is that I want a Set Point for the flow, below which I will get 1) an indication of alarm in SCADA , 2) an output signal for the alarm to activate a signaling device and 3) 1 and 2 only when the valve is open.We use Siemens PLC. Any relevant information or basic steps for how to do the programming part will be helpful. Thank you in advance

RE: Siemens Step 7 programming QUESTION

I steer clear of those style PLCs but to do your task it doesn't matter as all PLCs are about the same for that.

You simply setup rungs to cause both your #1 and #2 to happen as you desire.
Once you have that you then "condition" both those events (#1, #2) by the state of the valve.

Example:
---[FLOW < Lowlimit]-----------------------------------------------------(alarm)---

Then condition it:
---[FLOW < Lowlimit]--------------[VALVE OPEN]---------------------------(alarm)---

Keith Cress
kcress - http://www.flaminsystems.com

RE: Siemens Step 7 programming QUESTION

watch youtube just search what your looking for on site. Otherwise you could go to a local siemens rep/dealer and get the training there. Usually local support is helpful if you have a real project.

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