BR/BD 100/250 R BP / RI TroubleshootingPage 143 / 171Service Manual 08.20076.2.4 Head CPU (A1) error messagesModule FaultclassificationDisplay code ActionHead CPUForward andreverse operationare present at thesame timeK1/163 1. Check function of travel direction switch (S2) (*)and contact bonding.2. Check cabling from (S2) to the module (A2) or tomodule (A1) for short circuiting to the root.3. Check correct cabling with (A2) and/or (A1).4. If error continues, replace A2 and/or (A1).(*) Connected to (A2) in BR/BD 100-120/250 R/I(S2).Malfunction ofparameter bufferK1/171 1. Software error in process control -> developer:2. Replace A1 with A1 for new firmware.Protocol error inbus transmissionK1/172 1. Perform key switch (S0) reset several times.2. If errors continue, test single module coupling, forthis, connect head CPU (A1) with only one ran-dom module as direct bus. If error is replaced byanother, test with other modules until the mal-functioning module is found. Replace the mal-functioning module.3. If the error continues, inform the developer.4. Replace (A1) with (A1) for new firmware.Module statusquery is notpossibleK1/173Command bufferoverflowK1/174 1. Perform key switch (S0) reset.2. If fault remains, replace A1.3. Do not activate the program switch continuously,i.e. do not continuously perform program changesbelow 1-2 seconds in the timing code!
