11/27/2017 10:07 AM | |
Posts: 23 Rating:
|
I am confused I do not find pid 3_step for step 7 v5.5 I need to control the water temperature with a temperature sensor through a ssr relay, and I understand the pid 3)step is easiest. can someone help me? ------------------------------------------------------------------------------------------ |
Last edited by: Jen_Moderator at: 11/27/2017 2:20:41 PMNew subject after splitting |
|
11/27/2017 2:43 PM | |
Joined: 12/18/2014 Last visit: 8/28/2024 Posts: 33635 Rating:
|
Do you mean this: Step Control with SFB 42/FB 42 "CONT_S" You found this block in the Standard Library unter the PID Control Blocks. AttachmentFB42.pdf (355 Downloads) |
11/28/2017 2:32 PM | |
Joined: 9/27/2006 Last visit: 8/28/2024 Posts: 12280 Rating:
|
Hello mugurelgi5; If you open the online help files for FB41 and SFB41 (Cont_C), you will see it is the same file. So the function blocks are the same. You can use one or the other, except for one thing: not all SFBs and SFCs are actually available on all CPUs of the S7-300 family. If you look at the attachment below, taken from the S7-300 Instruction list manual, you will see that the CPU 312 for example has not been setup to run SFB41. If you have such a PLC, opening the Blocks folder online will confirm that is is missing in the integrated blocks of the CPU. https://support.industry.siemens.com/cs/ww/en/view/31977679 So if your CPU does not directly support SFB41, you can use FB41, but it will require a bit more memory in your program. Hope this helps, Daniel Chartier Edit: for heating applications with ssr relays with a PWM output, check out FB 58 TCONT_CP: D.C. |
Last edited by: dchartier at: 11/28/2017 2:45:02 PMLast edited by: Jen_Moderator at: 11/29/2017 10:49:48 AMInserted right link. |
|
11/29/2017 10:59 AM | |
Joined: 6/19/2017 Last visit: 8/5/2024 Posts: 8175 Rating:
|
New question published by mugurelgi5 is split to a separate thread with the subject Which sample can use for continuous controller or pulse control ?. Best regards |
My Forum is the place to personalize your profile, |
|
Follow us on