2) Overflow and Underflow in Binary Operations (16-bit or 32-bit) ........198
3) Overflow and Underflow in BCD Operations (4-digit or 8-digit).........199
CHAPTER 7: TROUBLESHOOTING
7-1. Self-diagnostic Function ....................................................................................202
1. Operation Monitor LEDs When an Error Occurs.........................................202
2. Operation Status When an Error Occurs ......................................................203
1) Duplicated Output Error (Total-check Error) ........................................203
2) Battery Error (Self-diagnostic Error).....................................................203
3) Operation Error (Self-diagnostic Error).................................................203
7-2. Troubleshooting .................................................................................................204
1. Points to be Checked When an Error Occurs ...............................................204
■ When an ERR. LED is ON.....................................................................205
■ When an ALARM LED is ON...............................................................209
■ When all LEDs are OFF.........................................................................210
■ Diagnosing output malfunction..............................................................211
■ When “PLC=COMM. ERR” is displayed on the NPST-GR screen......214
■ When “PROTECT ERROR” is displayed..............................................215
7-3. Maintenance .......................................................................................................216
1. Preventive Maintenance ...............................................................................216
2. Replacement of Backup Battery...................................................................216
1) Battery Life ............................................................................................216
2) How to Replace Backup Battery............................................................217
3. Removable Terminal ...................................................................................217
CHAPTER 8: APPENDIX
8-1. FP1 I/O Allocation Table...................................................................................220
8-2. Table of Memory Areas .....................................................................................221
8-3. Table of Special Internal Relays ........................................................................223
8-4. Table of Special Data Registers .........................................................................226
8-5. System Registers ................................................................................................230
1. What are System Registers...........................................................................230
2. Table of System Registers............................................................................232
8-6. Versions of Programming Tools ........................................................................241
1. Differences Between NPST-GR Ver. 2.4 and 3.1........................................241
2. Differences Between the FP Programmer and FP Programmer II ................243
8-7. FP1 CPU Version 2.7.........................................................................................245
8-8. FP1 Modem Communication .............................................................................246
1. Using the Programming Tool Port (RS422).................................................246
2. Using the RS232C Port.................................................................................248
3. System Configuration: One Computer and Two or More Programmable
Controllers ....................................................................................................251
4. NPST-GR Settings........................................................................................252
8-9. Terminology.......................................................................................................254
8-10. Product Types.....................................................................................................260
1. Control Units ................................................................................................260
2. Expansion Units............................................................................................262
3. Intelligent Units............................................................................................263
4. Link Units.....................................................................................................263
5. Programming Tools......................................................................................263
6. Maintenance Parts.........................................................................................265
INDEX....................................................................................................................................266
RECORD OF CHANGES....................................................................................................271
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