Applies To:
  • CitectSCADA 1.00 1.01 1.10 1.11 1.20 2.00 2.01

Question: When I run my single Citect stand alone, I get a 2 second response time from the PLC. However when I connect this Citect to another Citect over CiNet, the response time increased to 10 seconds. What is causing this problem? 

What may be happening is as follows: Both of your Citects are I/O Servers with PLCs or DISK PLCs attached. When you have only one Citect running, all the PLC requests are being serviced locally and any remote PLC request will fail immediately because the other I/O Servers are not running. When you startup both Citects, the first Citect will start getting data from the second. This will slow the response time down as the request must now be passed via CiNet from the first Citect to the second Citect. The CiNet is becoming bogged down and this will slow down the response time of Citects. You can check to see if this link is becoming bogged by looking the debug kernel "PAGE DRIVER" and checking the rate of data transfer over the link.