Rockwell Automation DAG6.5.8 APPLICATION GUIDE SCADA SYSTEM - Manual (Page 55)

Publication AG-UM008C-EN-P - February 2005
Configuring Enhanced PLC-5 Processors 2-17
Options Station Address Define the octal address of the processor on the DF1 half-duplex link. Each station
on a link must have a unique address. Choose an address between 0 and 376
8
.
Station address 377
8
is the broadcast address, which you cannot select as a
station’s individual address.
DF1 Retries The number of times a slave station retries a message before the slave station
declares the message undeliverable.
RTS Send Delay RTS send delay is the amount of time, in 20 millisecond increments, that elapses
between the assertion of the RTS signal and the beginning of the message
transmission. This time allows the modem to prepare to transmit the message.
The CTS (Clear-to-Send) signal must be high for transmission to occur.
RTS Off Delay RTS off delay is the amount of time, in 20 millisecond increments, that elapses
between the end of the message transmission and the de-assertion of the RTS
signal. This time delay is a buffer to make sure that the modem has transmitted the
message but should normally be left at zero.
ACK Timeout Define the amount of time, in 20 millisecond increments, that you want the
processor to wait for an acknowledgment from the master station to its transmitted
message.
Detect Duplicate Messages Duplicate packet detection lets the PLC-5 processor detect if it has received a
message that is a duplicate of its most recent message from the master station. If
you choose detect duplicate messages, the processor will acknowledge (ACK) the
message but will not act on it since it has already performed the message’s task
when it received the command from the first message.
If you want to detect duplicate packets and discard them, check this parameter. If
you want to accept duplicate packets and execute them, leave this parameter
unchecked.
MSG Application Timeout Define the number of 30 second increments within which the reply message must be
received before the error bit is set on the message. The timer starts when the ACK is
received.
RSLogix 5 Tab Parameter Selections