Rockwell Automation DAG6.5.8 APPLICATION GUIDE SCADA SYSTEM - Manual (Page 54)

Publication AG-UM008C-EN-P - February 2005
2-16 Configuring Enhanced PLC-5 Processors
Table 2.4 Communication Parameters for a PLC-5 Slave Station.
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 Table 2.5 on
page 2-18 for a description of what this file contains.
Remote Mode Change
Enable 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 (unchecked) 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 slave station 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 transmits a constant carrier and the
slave modem is half-duplex, choose HALF-DUPLEX MODEM WITH
CONTINUOUS CARRIER.
•
If all the modems in the system are half-duplex, choose HALF-DUPLEX
MODEM WITHOUT CONTINUOUS CARRIER.
Parity Parity provides additional message packet error detection. To implement even parity
checking, choose Even. To implement no parity checking, choose None.
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.