194 Rockwell Automation Publication 1766-UM001O-EN-P - September 2021
Appendix F MicroLogix 1400 Distributed Network Protocol
The valid range is 0…65535. Default value is 0.
RTS Off Delay (x20 ms)
When the Control is set at Half Duplex Modem (CTS/RTS handshaking), this
feature is enabled. This specifies a time delay between the end of a
transmission and dropping of the RTS signal.
The valid range is 0…65535. Default value is 0.
RTS Send Delay (x20 ms)
When the Control is set at Half Duplex Modem (CTS/RTS handshaking), this
entry is enabled. This specifies a time delay between the raising of the RTS and
the initiation of a transmission.
The valid range is 0…65535. Default value is 0.
Max Random Delay (x1 ms)
This parameter is used with Pre-transmit Delay (x1 ms) for Collision Avoidance
on RS-485 network. For more details, see Collision Avoidance on page 254.
The valid range is 0…65535. Default value is 0.
Channel 1 (Ethernet) Link Layer Configuration Parameters
This section is only applicable for MicroLogix 1400 Series B and Series C
controllers.
The DNP3 over IP subsystem in the controller supports Listening End Point,
TCP Dual End Point and Datagram End Point type.
Listening End Point type supports a single TCP connection as a Server and
UDP datagram.
TCP Dual End Point type supports a single TCP connection as a Server, a single
TCP connection as a Client and UDP datagram.
Datagram End Point type supports UDP datagram from DNP3 Masters. The
default TCP and UDP port numbers are 20000 and the port numbers are
configurable.
The End Point type can be determined by the parameter End Point Type.
According to the parameter, the controller works as different End Point types.
See Table 22
for each configuration.
Table 22 - End Point Types
End Point Type Connection Description
Listening End Point
A single TCP server connection
Any of the requests are accepted and the responses are transmitted via this connection.
The unsolicited responses are transmitted via this connection when this connection is
available.
UDP datagram
Accepts only broadcast packets when DNP3 destination node is one of 0xFFFD, 0xFFFE and
0xFFFF in the request.
Dual End Point A single TCP server connection
Any of the requests are accepted and the responses are transmitted via this connection.
The unsolicited responses are transmitted via this connection when this connection is
available.
This connection has higher priority than the Client connection.
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