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SFC Processing - Opening Valve

11/22/2024 11:09 AM	Rate (0)
SeoYoon-hee Joined: 5/25/2024 Last visit: 9/2/2025 Posts: 38 Rating: (0)	Hi, Based on my understanding, Initialization: Run once at the start of the step Processing: Run continuously until transition condition is reached Termination: Run once at the end of the step after transition condition is reached. So if let's say I'm opening a valve, OpenAut = 1, I can put either at Initialization or Processing, assume I'm writing in Processing, does that mean every second I'm sending OpenAut = 1 to the valve? or is the command being sent just once? If it's being sent just once, I can just write in Initialization right? I'm a bit confused like how often are the commands being executed in Processing?

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11/22/2024 11:44 AM	Rate (1)
Oreca Platinum Expert Joined: 3/14/2008 Last visit: 9/3/2025 Posts: 2216 Rating: (985)	Hi, You're assumption is correct. If you have the signal set in processing, OpenAuto remains TRUE during processing. There are some basic rules like: - If you do not have anything configured in Initialization, then Processing is directly executed - If you go to hold from a step, the step is not executed in Termination, If hold is lifted and you resume back to the current step, then Initialization is not executed anymore. It's fine if you use OpenAut=1 in Init and OpenAut=0 in Termination. Remember to check the feature bit 4 as well. It let's you handle the valve in Switch mode or Button mode. Default is set to button mode (bit 4=0), which means you need to use CloseAut = 1 and OpenAut = 0 to close the valve again. If you set the bit 4 to 1, you only use OpenAut=1 to open and OpenAut=0 to close the valve.
	If I could help you, you can use the RATE button. Thank you. Prospact Netherlands...your PCS7 and PCS neo Expert Topic: PCS7 Complete Overview
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This contribution was helpful to 1 thankful Users SeoYoon-hee