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SECTION 6
Advanced Functions
This section provides details on the following advanced functions: cycle time/high-speed processing functions, index
register functions, serial communications functions, startup and maintenance functions, diagnostic and debugging
functions, Programming Device functions, and the Basic I/O Unit input response time settings.
6-1 Cycle Time/High-speed Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235
6-1-1 Minimum Cycle Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235
6-1-2 Maximum Cycle Time (Watch Cycle Time). . . . . . . . . . . . . . . . . . . 236
6-1-3 Cycle Time Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 236
6-1-4 High-speed Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237
6-1-5 Interrupt Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237
6-1-6 I/O Refreshing Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238
6-1-7 Disabling Special I/O Unit Cyclic Refreshing . . . . . . . . . . . . . . . . . 239
6-1-8 Improving Refresh Response for CPU Bus Unit Data . . . . . . . . . . . 240
6-1-9 Maximum Data Link I/O Response Time. . . . . . . . . . . . . . . . . . . . . 242
6-1-10 Background Execution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 244
6-1-11 Sharing Index and Data Registers between Tasks . . . . . . . . . . . . . . 250
6-2 Index Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 252
6-2-1 What Are Index Registers?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 252
6-2-2 Using Index Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 252
6-2-3 Processing Related to Index Registers . . . . . . . . . . . . . . . . . . . . . . . 255
6-3 Serial Communications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 261
6-3-1 Host Link Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 263
6-3-2 No-protocol Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 268
6-3-3 NT Link (1:N Mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 269
6-3-4 Serial PLC Links (CJ1M CPU Units Only) . . . . . . . . . . . . . . . . . . . 270
6-4 Changing the Timer/Counter PV Refresh Mode. . . . . . . . . . . . . . . . . . . . . . . 276
6-4-1 Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 276
6-4-2 Functional Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277
6-4-3 BCD Mode/Binary Mode Selection and Confirmation . . . . . . . . . . 278
6-4-4 BCD Mode/Binary Mode Mnemonics and Data . . . . . . . . . . . . . . . 279
6-4-5 Restrictions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 280
6-4-6 Instructions and Operands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 281
6-5 Using a Scheduled Interrupt as a High-precision Timer (CJ1M Only). . . . . . 284
6-5-1 Setting the Scheduled Interrupt to Units of 0.1 ms. . . . . . . . . . . . . . 284
6-5-2 Specifying a Reset Start with MSKS(690). . . . . . . . . . . . . . . . . . . . 285
6-5-3 Reading the Internal Timer PV with MSKR(692) . . . . . . . . . . . . . . 285
6-6 Startup Settings and Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 286
6-6-1 Hot Start/Hot Stop Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 286
6-6-2 Startup Mode Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 287
6-6-3 RUN Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 288
6-6-4 Power OFF Detection Delay Setting . . . . . . . . . . . . . . . . . . . . . . . . 288
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