Rockwell Automation DAG6.5.8 APPLICATION GUIDE SCADA SYSTEM - Manual (Page 43)

Publication AG-UM008C-EN-P - February 2005
Configuring Enhanced PLC-5 Processors 2-5
Define the Communication Driver Characteristics
Use Table 2.1 to help you understand the communication parameters
you need to specify on the Channel Configuration screen for
standard-communication mode.
Use Worksheet 2.1 (page D-5) for an example configuration and to
record your station’s configuration.
Table 2.1 Communication Parameters for a PLC-5 Master Station Using
Standard-Communication Mode
RSLogix 5 Tab Parameter Selections
Channel 0 Diagnostic File Select an unused integer file to store channel status information. You must define a diagnostic
file in order to be able to view channel 0 status. See See Table 2.2 on page 2-8 for a
description of what is in this file.
Remote Mode
Change Check enable remote mode change if you want to switch the configuration of the channel
during runtime. Leave the parameter set at the default (unchecked) if you are not using this
feature.
Mode Attention
Character Select a character that will signal a remote mode change. Leave the parameter set at the
default if you are not using remote mode change.
System Mode
Character Select a character that will signal the channel to switch into system mode. Leave the
parameter set at the default if you are not using remote mode change.
User Mode
Character Select a character that will signal the channel to switch into user mode. Leave the parameter
set at the default if you are not using remote mode change.
Serial Port Baud Rate Select a communication rate that all devices in your system support. Configure all devices in
the system for the same communication rate.
Bits Per Character Match the number of bits per character to the devices with which you are communicating.
Stop Bits Match the number of stop bits to the devices with which you are communicating.
Control Line This parameter defines the mode in which the master 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 full-duplex, choose
FULL-DUPLEX MODEM.
•
If all the modems in the system are half-duplex, choose HALF-DUPLEX MODEM
WITHOUT CONTINUOUS CARRIER.
Serial Port Error Detect 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 system support.
When possible, choose CRC.