Rockwell Automation DAG6.5.8 APPLICATION GUIDE SCADA SYSTEM - Manual (Page 161)

Publication AG-UM008C-EN-P - February 2005
Configuring SLC 5/03, 5/04, and 5/05 Processors 4-23
Use Worksheet 4.3 (page D-16) for an example configuration and to
record your station’s configuration.
Define these parameters when configuring an SLC 5/03, 5/04, or 5/05
processor as a slave station.
Table 4.5 Configuring an SLC 5/03, 5/04, or 5/05 Processor as a Slave Station
Tab Parameter Selections
General Diagnostic File SLC 5/03 (OS 302 C or higher), 5/04 (OS 401 C or higher) and 5/05 only. Select an
unused file to store channel status information. You must define a diagnostic file in
order to be able to view channel 0 status. See Table 4.6 on page 4-25 for a file
description.
Chan. 0 System Baud Rate Select a communication rate that all devices in your system support. Configure all
devices in the system for the same communication rate.
Parity Parity provides additional message packet error detection. To implement even parity
checking, choose Even. To implement no parity checking, choose None.
Stop Bits Match the number of stop bits to the device with which you are communicating.
Node Address A node address identifies the processor on the DF1 half-duplex link. Each station on a
link must have a unique node address. Choose an address between 0
10
and 254
10.
Node
address 255
10
is the broadcast address, which you cannot select as a station’s
individual address.
Control Line This parameter defines the mode in which the driver operates. Choose a method
appropriate for your system’s configuration:
•
If you are not using a modem, choose NO HANDSHAKING.
•
If the master modem is full duplex and the slave modem is half-duplex, choose
HALF-DUPLEX WITH CONTINUOUS CARRIER.
•
If all the modems in the system are half-duplex, choose HALF-DUPLEX
WITHOUT CONTINUOUS CARRIER.
See page 4-5 for descriptions of the control line operation settings.
Error Detection With this selection, you choose how the processor checks the accuracy of each DF1
packet transmission.
BCC: This algorithm provides a medium level of data security. It cannot detect:
•
transposition of bytes during transmission of a packet
•
the insertion or deletion of data values of zero within a packet
CRC: This algorithm provides a higher level of data security.
Select an error detection method that all devices in your configuration can use.
When possible, choose CRC.
Duplicate Packet Detect Duplicate Packet Detect lets the SLC detect if it has received a message that is a
duplicate of its most recent message from the master station. If you choose duplicate
detect, 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.