Df1 Half-Duplex Slave Channel Status - Allen-Bradley SLC 500 Series Reference Manual
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13-74
SLC Communication Channels
See Table 13.23 for details concerning
the DF1 Half-Duplex Slave Channel
Status Screen.
Table 13.23 SLC 5/03 and Higher Channel 0 DF1 Half-duplex Slave Channel Status
Status Field
DCD Recover
Messages Sent
Messages Received
Polling Received
Received NAK
Lack of Memory/No ACK
Sent
Lost Modem
Publication 1747-RM001G-EN-P - November 2008
DF1 Half-duplex Slave Channel Status
Channel Status data is stored in the diagnostic file defined on the Channel 0
Configuration screen. See Table 13.23 for information regarding the diagnostic
counter data displayed.
Double-click on the Channel Status
Icon Located beneath the
Configuration icon to bring up the
Channel Status screen.
Diagnostic File Location
word 11
word 1
word 2
word 6
word 5
word 8
word 12
Definition
The number of times the processor detects the DCD handshaking line has
gone low to high
The total number of DF1 messages sent by the processor (including
message retries)
The number of messages received with no errors
The number of master poll packets received by the processor
The number of NAKs received by the processor
The number of times the processor could not receive a message because
it did not have available memory
The number of times the lost modem bit has gone low to high
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