Specifications

52 RSLinx – Training Guide
Keep DeviceNet connection open
Enabling this checkbox may increase DeviceNet Traffic. Do not check this box if the poll
rate accuracy is greater than 5 seconds.
Enable this option if your poll rate exceeds 5 seconds and your desired poll rate
accuracy is 5-10 seconds. The target device closes the connection if no communication
occurs in 5 seconds.
• RSLinx will keep the explicit message connection open between the DDE server
and the node configured in the topic.
Fail Unsolicited messages if data will be overwritten
Enable this box for the DDE/OPC client to receive all unsolicited messages, even if
RSLinx must fail messages to ensure that no data is lost to the DDE/OPC client.
• This option is useful if the PLC sends too many unsolicited messages for the
DDE/OPC client to handle, or the OPC client’s group rate is slower that the PLC
is sending unsolicited messages.
• If enabled, you must have ladder logic written in the PLC program to handle
RSLinx failing the message for the PLC to resend the message.