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The DF1 RS-232 Async Circuit is a special serial communications path to one or more Allen Bradley DF1 field units from a common Master Channel. Use this circuit instead of the generic AsyncCircuit when configuring a DF1 serial field unit under a Master Channel. You should not use the standard AsyncCircuit when polling DF1 PLCs.
| Attributes | Function |
|---|---|
| Object Type | Df1Rs232circuit |
| Parent(s) | System → Clients → Master Channels → Master Channel |
| Instance | Should be set to 0. Only one circuit (Network or Async) is allowed when using the DF1 master protocol. The DF1 Async Circuit should have at least one Field Unit child object defined under it. |
| Properties | Values |
|---|---|
| DH Link Type | Select the Allen Bradley link type (DH or DH+). Configure this to "DH." The RediGate does not currently support the Data Highway Plus (DH+) protocol, which requires special hardware. |
| Station DHP Address | Enter the DF1 (master) station address taken by the RediGate on the Data Highway network. Note that the master station address is different from the device address being polled, which is configured under the FieldUnit definition. |
| Link Protocol | Select the link protocol to use ('Full Duplex' or 'Half Duplex'). This should be set to match the full-duplex (peer to peer) or half-duplex setting of the PLC. |
| Serial Port | Select the Async serial port to use for this circuit. The selected port must be defined as an AsyncPort object under Networks, where its serial properties (baud rate, etc.) are defined. |
| Message Timeout | Enter the message timeout in milliseconds. This is the amount of time to wait for a message response. In the DF1 protocol, there may be multiple messages to a single poll, such as acknowledgments. |
| Message Timeouts | Enter the number of message timeouts before declaring a message to have failed. |
| Poll Timeout | Enter the poll timeout in milliseconds. This is the amount of time to wait for the initial byte of a response to a poll. For DF1 used on an Async Circuit, the Master Channel's Response Timeout parameter is unused. |
| Poll Timeouts | Enter the number of poll timeouts before aborting a poll request. |
| Demark Timeout | Enter the byte timeout in milliseconds to wait for the last byte of a packet. The Demark Timeout is used to help identify the end of a packet after the RediGate has started receiving bytes on the serial port. |
| Error Check | Select the error check type (BCC, or CRC-16). |
Network Circuit
A Network Circuit is an IP network communications path to one or more field units from a common Master Channel. The Network Circuit is used when the field unit is connected to the RediGate over a TCP/IP network.
To configure the Master Network Port in Circuit for Allen Bradley PLCs:
- For the DF1 or CSP protocol, do not use the actual TCP port in this fieldfor the Master Network Port. The RediGate will automatically default to using port number 44818.
Instead, set the Master Network Port property to the slot number in the PLC containing the PLC CPU. Often, this will be 0, but check with the PLC setup. - For the CSP protocol, use Master Network Port = 2222.
- Set the Circuit Type to be "Network DF1 Circuit" (not the default "Network Circuit" option).
- Set the Connect Table to the IP address of the PLC.
See the RediGate Configuration Manual for information on configuring the NetCircuit object.
AsyncPort
If using a Df1Rs232circuit for serial DF1 devices, make sure to include a COM port (System>Networks>AsyncPort) object in the configuration with the instance number matching the physical COM port, and the baud rate corresponding to the field device’s setting.
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