CTSoft

I used RSView32 V7.20(CPR 7) did not seen this problem. I guess your vbOk will set to 1, is came from lthe last msgboxs before trigger this probelm msgboxs. Try these, highlight the vbOK and right click mouse, add it into watch window. Again step through your code, and watch the vbOK value.

Is there anyway we can detect the transition happen when primary processor going to switch from RUN to Program mode?

Thanks for the hint and information, gentlemens. I have some issues that I need your advise again. How can i use program logic to initiate the switchover when primary processor is switched to program mode? I had read through the user manual 1756-UM523F, it only guided me how to configure a message to initiate switchover. Any suggestions?

Thanks for the information, It seen to be worked now. Refer to attached screen shot on offline (forgot capture when online), I set the date and time by using change date and time button, instead of using date,time and zone workstation button. workstation button to set the date and time.

Contr_conn, Thanks for your help. The date in the SRM is updated now , but for the current time it's 8 hours different. Look like this is due to the time zone GMT +0800. Is there anyway to work around it?

Send_Message_to_SRM.doc Hi to all, Presently, I'm working on Controllogix Redundant System. The chassis is 4 slot chassis, on slot 0: 1756-L61, slot 1: 1756-CNBR slot 2~3 : 1757-SRM. I want the SRM clock synchronize with the controllogix processor date and time. But I'm not able to make it work. Anyone can advise, where i make the mistake? Attached screen shot for reference.Thanks. Best Regards, CT

Hi,good day everybody. I want find out, did anybody used before the premium warn backup system? Can you share the knowledge? Actually what is warn bacup mean?

Thanks,Peter.I note that,future will switch the PID to man mode. Presently the PID instruction in running without condition. What you said, if addin 1 sec on condition in front of this PID. Would it help to reset the integrator?

I agreed,Peter. In normal operation this controller perform very well. I noticed this when the system on statup after maintenance,while the PV is less than SP for long period on auto mode PID; for sure the CV will went to 0%. But when the system back to operation, the PV start rising and above than SP, I expected the CV will responce too but it did not , the value 0% sit there for some period,then after it start responding. The system I attend is Process Cooling Water.

What Ken said is correct. refer to manual 1746-NR4 ,chapter 5 page 9. you will get more clear picture.

I had a doubt sit on my mind for last few year. Hope with this opportunity, all gurus here can given some lesson. "PID Wind Up" - The problem I had is the temperature control with PID loop's CV (control Variable) went to 0% and stay there for 2min++ ,then it start to responce gradually increase CV value. One of the senior told me that, this is due PID wind up.How it happen and how to get away from this issue?

Hi,Mr.Kurt, Past project I'm used SLC505 too. Here attach the PID logic for your reference. You may find out more information you need on this logic. PID_for_reference.RSS

Assuming your SLC node =2 , ML1200 node = 4. On ML1200, map all the input bits you want into Integer words. Example : Xic I:0/0 OTE N101:0/0 , xic I:0/1 OTE N101:0/1 ...... and so on. SOR XIC S:4/6 MSG MG9:0 Read 500CPU Local 0 2 N100:0 N100:0 10 5 132 EOR Paste this logic into your ladder. This is to read in the output status from SLC unit. On SLC, Assume your output modules located at slot 2 and 3. Example : COP #O:2.0 #N100:0 2 SOR XIC S:4/6 MSG READ 500CPU LOCAL N9:0 1 4 N101:0 N101:0 10 5 0 EOR Paste this logic into your ladder. This is to read in the INPUT status from ML1200 unit. Now, you can test out,by giving I:0/0 ON. Check SLC data file N101:0/0, it should received ON too. Hope this information will help you.

First,on RSlinx configure drivers,delete the PIC driver.(Make sure not other RS application running,except RSlinx,otherwise it would not allow you to delete the driver.) Then go to windows start button - All program - Rockwell Software - RSLinx - RSLinx Launch control panel. Click stop button ,then uncheck Always Run As Service;follow click start button to run back the RSlinx. Open RSlinx application and now try again configure PIC driver.

I guess you did not change the communication driver on your ML1200 to DH485 protocol, check it out. The default ML1200 is always DF1 driver. Help this will help.