Logix5000 Controllers General Instructions - SLAC Confluence

182 Input/Output Instructions (MSG, GSV, SSV, IOT)Access the DF1 objectThe DF1 object provides an interface to the DF1 communicationdriver that you can configure for the serial port.Attribute Data Type Instruction DescriptionACKTimeout DINT GSV The amount of time to wait for an acknowledgment to a messagetransmission (point-to-point and master only).Valid value 0-32,767. Delay in counts of 20 msec periods. Defaultis 50 (1 second).DiagnosticCounters INT[19] GSV Array of diagnostic counters for the DF1 communication driver.word offset DF1 point-to-point DF1 slave master0 signature (0x0043) signature (0x0042) signature (0x0044)1 modem bits modem bits modem bits2 packets sent packets sent packets sent3 packets received packets received packets received4 undelivered packets undelivered packets undelivered packets5 unused messages retried messages retried6 NAKs received NAKs received unused7 ENQs received poll packets received unused8 bad packets NAKed bad packets not ACKed bad packets not ACKed9 no memory sent NAK no memory not ACKed unused10 duplicate packets received duplicate packets received duplicate packets received11 bad characters received unused unused12 DCD recoveries count DCD recoveries count DCD recoveries count13 lost modem count lost modem count lost modem count14 unused unused priority scan time maximum15 unused unused priority scan time last16 unused unused normal scan time maximum17 unused unused normal scant time last18 ENQs sent unused unusedDuplicateDetection SINT GSV Enables duplicate message detection.Value: Meaning:0 duplicate message detection disablednon zero duplicate message detection disabledEmbeddedResponseEnable SINT GSV Enables embedded response functionality (point-to-point only).Value: Meaning:0 initiated only after one is received (default)1 enabled unconditionallyENQTransmitLimit 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 enabledPublication 1756-RM003I-EN-P - January 2007