Honeywell UDC3500 - Page 8

3/07 UDC3500 Universal Digital Controller Product Manual viii
7 TROUBLESHOOTING/SERVICE......................................................................307
7.1 Overview.....................................................................................................................................307
7.2 Troubleshooting Aids..................................................................................................................308
7.3 Power-up Tests............................................................................................................................310
7.4 Status Tests .................................................................................................................................310
7.5 Background Tests and Diagnostic Messages..............................................................................311
7.6 Controller Failure Symptoms......................................................................................................316
7.7 Troubleshooting Procedures .......................................................................................................317
7.7.1 Procedure #1 – Power ......................................................................................................318
7.7.2 Procedure #2 – Current Outputs.......................................................................................318
7.7.3 Procedure #3 – Position Proportional ..............................................................................320
7.7.4 Procedure #4 – Time Proportional...................................................................................323
7.7.5 Procedure #5 – Current/Time or Time Current/Proportional...........................................324
7.7.6 Procedure #6 – Alarm Relays ..........................................................................................325
7.7.7 Procedure #7 – Keyboard.................................................................................................326
7.7.8 Procedure #8 – Analog Input ...........................................................................................327
7.7.9 Procedure #9 – RS-485 ....................................................................................................328
7.7.10 Procedure #10 – Ethernet .............................................................................................330
7.7.11 Procedure #11 – Email .................................................................................................331
7.8 Restoring Factory Configuration ................................................................................................332
7.9 Software Upgrades......................................................................................................................333
8 PARTS LIST......................................................................................................335
8.1 Exploded View............................................................................................................................335
8.2 Removing the chassis..................................................................................................................337
9 MODBUS RTU FUNCTION CODES..................................................................338
9.1 Overview.....................................................................................................................................338
9.2 General Information....................................................................................................................338
9.3 Function Code 20 (14h) - Read Configuration Reference Data..................................................340
9.3.1 Read Configuration Examples .........................................................................................342
9.4 Function Code 21 (15h) - Write Configuration Reference Data.................................................344
9.4.1 Write Configuration Examples ........................................................................................346
10 MODBUS READ, WRITE AND OVERRIDE PARAMETERS PLUS EXCEPTION
CODES
........................................................................................................................347
10.1 Overview.................................................................................................................................347
10.2 Reading Control Data..............................................................................................................350
10.3 Read Software Options Status.................................................................................................351
10.4 Miscellaneous Read Onlys......................................................................................................352
10.4.1 Register Addresses for Read Onlys..............................................................................352
10.4.2 SetPoint Program Read Only Information....................................................................352