Rockwell Automation 1785-Lxxx Enhanced and Ethernet PLC-5 Programmable Controllers User Manual
Page 173
Publication 1785-UM012D-EN-P - July 2005
Communicating with Devices on a Serial Link 10-23
System Mode (DF1 Master) Status Scree
n
Descriptions of System Mode Status Screen Fields
Status Field
Word Bit
Description
DCD recover
11
Displays the number of times the controller detects the DCD-handshaking line has gone low to
high.
Messages sent
1
Displays the total number of DF1 messages sent by the controller (included message retry).
Messages received
2
Displays the number of messages the controller received with no error.
EOT received on first poll
8
Displays the number of times the master received an EOT in response to the first poll of a station.
Lost modem
12
Displays the number of times a modem was disconnected.
Messages retried
4
For slave and master mode, displays the number of messages resent.
Undelivered messages
3
Displays number of messages that were sent by controller but not received by the destination
device.
Duplicate messages received
9
Displays the number of times the controller received a message packet identical to the previous
message packet.
Bad packet/no ACK sent
7
Displays the number of incorrect data packets that the controller has received.
Last poll list scan last
5
The time it took to complete the previous scan of the normal station poll list.
Last priority poll list scan last
10
The time it took to complete the previous scan of the priority station poll list.
Max normal poll list scan
6
The maximum time taken to complete a scan of the normal station poll list.
Max priority poll list scan
13
The maximum time taken to complete a scan of the priority station poll list.
ENQs received
6
For point-to-point mode, displays the number of inquiries made by the destination device.
ENQs sent
4
For point-to-point mode, displays the number of inquiries made by the controller.
Received NAK
5
For Point-to-point and slave mode, displays the number of NAK messages received by the
controller.
Lack of memory/sent NAK
Lack of memory/no ACK sent
8
For point-to-point and slave mode, displays the number of times the controller could not receive
a message because it did not have enough memory.
Polling received
6
For slave mode, displays number of times a DF1 master device has polled controller for a
message.