9
10. SAE J2497 (PLC) DIAGNOSTIC LINK
All newer towed vehicles transmit a signal over the power
linetothetowingvehicleABSECU.Thesignal,usinga
heavy vehicle industry standard known as PowerLine
Carrier(PLC\J2497),isbroadcastbythetrailerABSECU
overthebluewire(ignitionpowerline)oftheSAEJ560
connector and controls an in‑cab trailer ABS indicator lamp.
See Figures 7 and 8.
FIGURE 7 - POWER LINE WITHOUT PLC SIGNAL
FIGURE 8 - POWER LINE WITH PLC SIGNAL
The Bendix
®
TABS‑6
™
Adv MC module provides a data link
forPLCcommunicationfollowingtheSAEJ2497standard.
Bendix
®
ACom
®
diagnostics software (version 6.1 and
higher) and the Bendix
®
TrailerRemote Diagnostic Unit
(TRDU
™
) both support PLC communication with the
TABS‑6
Adv MC module.
PLC communication is applicable for 12-volt vehicle
applicationsonly.ThePLCcommunicationisdisabledfor
voltagesgreaterthan18volts.
Identifying and Measuring the PLC Signal
ATABS-6AdvMCmodulewillcontinuouslybroadcastPLC
messages that indicate trailer ABS status. At power‑up,
or during a trailerABS diagnostic Trouble Code (DTC)
condition, the TABS‑6 Adv MC module will signal the
tractor ABS unit to illuminate the dash‑mounted trailer ABS
indicator lamp.
Diagnostic tools are available that detect the presence
ofa PLCsignal andperform further systemdiagnostics
directly, using the power line. For more information on
these diagnostic tools, contact Bendix or refer to your local
authorized Bendix dealer or distributor.
An oscilloscope can also be used to verify the presence
andstrengthofaPLCsignalonthepowerline.ThePLC
signal is an amplitude and frequency modulated signal.
Dependingontheloadonthepowerline,theamplitude
ofthePLCsignalcanrangefrom2.5mVp-pto7.0Vp-p.
Suggestedoscilloscopesettingsare(ACcoupling,1volt/
div,100µsec/div).Thesignalshouldbemeasuredonpin7
oftheJ560connectoratthenoseofthetrailer.
11. SAE J1939 (CAN) DIAGNOSTIC LINK
The TABS‑6 Adv MC module provides a data link for
transmitting CAN information following the SAE J1939
standard.
Bendix
®
ACom
®
diagnostics software (version 6.1 and
higher) and the Bendix
®
Trailer Information Module both
support CAN communication with theTABS-6Adv MC
module.
Ignition power must be provided to the TABS‑6 Adv MC
module for the diagnostic link to be active.
12. AUXILIARY I/O
The TABS‑6 Adv MC module provides for up to six auxiliary
input/output(I/O)functions.See Chart 3.
Name
12-Pin
ECU
Conn.
(X2)
Auxiliary Functions
Auxiliary
Type
AuxI/O1
(AuxIO1)
1
High-SideDriver Output
DigitalInput Input
AuxI/O2
(AuxIO2)
2
High-SideDriver Output
DigitalInput Input
AuxI/O3
(AuxIO3)
3
High-SideDriver Output
DigitalInput Input
AuxRet12 11 Low-SideDriver Output
AuxRet3 12 Low-SideDriver Output
Sens_Sup 4 +5V Sensor Supply Output
Sens_In 5 Analog Input Input
Sens_Gnd 6 Low-SideDriver Input
CHART 3 – AUXILIARY I/OS
Bendix
®
ACom
®
diagnostic software (version 6.1 and
higher)supportsthecongurationoftheTABS-6AdvMC
moduleauxiliaryI/Os.