Ken Roach
Lifetime Supporting Member + Moderator
Since you can use the OPC Test Client to connect and communicate with the SLC controllers even in a "lockup" situation, you have proven that RSLinx Gateway is accepting new OPC requests, and that the SLC controllers are available to communicate with RSLinx.
It's unlikely that you are running out of TCP connections to the controllers; even the smallest and oldest 1747-L551 version of the SLC-5/05 supports 16 TCP connections. Besides, RSLinx Gateway is only going to use one TCP connection to the SLC, no matter how many requests are being made over OPC.
It's unlikely that you are running out of TCP connections to the controllers; even the smallest and oldest 1747-L551 version of the SLC-5/05 supports 16 TCP connections. Besides, RSLinx Gateway is only going to use one TCP connection to the SLC, no matter how many requests are being made over OPC.