Allen-Bradley Logix5000 Reference Manual

Rockwell Automation Publication 1756-RM003N-EN-P - October 2011 203
Input/Output Instructions (MSG, GSV, SSV, IOT) Chapter 4
DF1 Attributes
The DF1 object provides an interface to the DF1 communication driver that you
can configure for the serial port.
Attribute Data Type Instruction Description
ACKTimeout DINT GSV The amount of time to wait for an acknowledgment to a message transmission (point-to-point and
master only). Valid value 0-32,767. Delay in counts of 20 msec periods. Default is 50 (1 second).
Diagnostic
Counters
INT[19] GSV Array of diagnostic counters for the DF1 communication driver.
Word offsetDF1 point-to-pointDF1 slaveMaster
0Signature (0x0043)Signature (0x0042)Signature (0x0044)
1Modem bitsModem bitsModem bits
2Packets sentPackets sentPackets sent
3Packets receivedPackets receivedPackets received
4Undelivered packetsUndelivered packetsUndelivered packets
5UnusedMessages retriedMessages retried
6NAKs receivedNAKs receivedUnused
7ENQs receivedPoll packets receivedUnused
8Bad packets NAKedBad packets not ACKedBad packets not ACKed
9No memory sent NAKNo memory not ACKedUnused
10Duplicate packets receivedDuplicate packets receivedDuplicate packets received
11Bad characters receivedUnusedUnused
12DCD recoveries countDCD recoveries countDCD recoveries count
13Lost modem countLost modem countLost modem count
14UnusedUnusedPriority scan time maximum
15UnusedUnusedPriority scan time last
16UnusedUnusedNormal scan time maximum
17UnusedUnusedNormal scant time last
18ENQs sentUnusedUnused
Duplicate
Detection
SINT GSV Enables duplicate message detection.
Value Meaning
0 Duplicate message detection disabled
Non zero Duplicate message detection enabled
Embedded
ResponseEnable
SINT GSV Enables embedded response functionality (point-to-point only).
Value Meaning
0 Initiated only after one is received (default)
1 Enabled unconditionally
EnableStoreFwd SINT GSV Enables the store and forward behavior when receiving a message.
Value Meaning
0 Do not forward message
non zero See the store and forward table when receiving a message (default)
ENQTransmit
Limit
SINT GSV The number of inquiries (ENQs) to send after an ACK timeout (point-to-point only). Valid value 0-
127. Default setting is 3.
EOTSuppression SINT GSV Enable suppressing EOT transmissions in response to poll packets (slave only).
Value Meaning
0 EOT suppression disabled (disabled)
Non zero EOT suppression enabled
ErrorDetection SINT GSV Specifies the error-detection scheme.
Value Meaning
0 BCC (default)
1 CRC
MasterMessageTr
ansmit
SINT GSV Current value of the master message transmission (master only).
Value Meaning
0 Between station polls (default)
1 In poll sequence (in place of master’s station number)
MaxStation
Address
SINT GSV Current value (0...31) of the maximum node address on a DH-485 network. Default is 31.

Allen-Bradley Logix5000 Specifications

General

Brand	Allen-Bradley
Model	Logix5000
Category	Controller
Language	English