Rockwell Automation 1785-Lxxx Enhanced and Ethernet PLC-5 Programmable Controllers - Manual (Page 165)

Publication 1785-UM012D-EN-P - July 2005
Communicating with Devices on a Serial Link 10-15
This Field Specifies Configure by Doing the Following
Master message
transmit The current value of channel 0 master
message transmit If you want the master station to:
send all of the master station-initiated MSG instructions to the remote
stations before polling the next remote station in the poll list, choose
Between Station Polls
This method makes certain that master station-initiated messages are
sent in a timely and regular manner (after every remote station poll).
only send master station-initiated MSG instructions when the master’s
station number appears in the polling sequence, choose In Poll Sequence
With this method, sending master station-initiated messages are
dependent upon where and how often the master station appears in the
poll list. To achieve the same goal as the Between Station Polls method,
the master-station’s address would have to appear after every
remote-station’s address.
The controller sets a minor fault if you are using IN POLL SEQUENCE and
the master’s station is not in either the normal poll list or the priority
poll list.
Normal poll node file The integer file that contains the
addresses of the remote stations you
want in the normal poll list Enter an integer file number 0-255
Normal poll group size The quantity of active stations located
in the normal poll list that you want
polled during a scan through the
normal poll list before returning to the
priority poll list
Enter a valid value 10-999.
Priority poll node file The integer file that contains the
addresses of the remote stations you
want in the priority poll list Enter an integer file number 10-999.
Active station file The binary file that stores the station
addresses of all active stations on
the link. Enter a binary file number 10-999.