CTI 2500-200 running PID

Ted

Member
Join Date
Sep 2007
Location
Kansas
Posts
2
Hello,

I am using a CTI 2500-200 plc and 505 WorkShop and can not get PID loop to do anything. The program is stripped down to 1 rung and the PID. In the PID it is Enabled, the
PV Addr = V1
Loop Output Addr = V2
Remote SP = V3

I modify V1 and V3 to get the output to move, but it does not.
Am I missing something simple ??

Thank you

Ted
 
What are your V-Flag addresses? You have to to place the loop in auto and give it a setpoint. The remote setpoint only applies when the loop in in cascade.

You can manipulate the loop via a SFPGM or by setting bits in the the V-flag word.
To assign a setpoint use this in a SFPGM, I assume you are using loop 1.

MATH LSP1 := 50

Here's a chart on the v-flags:
lup.png


Bits 4 & 5 will give you the loops current mode, you can place in cascade by energizing bit 3.
 
Just a friendly reminder, the bits in words are somewhat different than most PLC's.
The MSB is bit 1 and the LSB is bit 16.
While most often MSB is bit 15 and LSB is bit 0.

505/2500
1,2,3,4,.......16

AB/others
15,14,13,12 ...........0
 

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