Honeywell UDC3500 Product Manual page 8

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
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