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
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