Allen-Bradley MicroLogix 1400 - DCD

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Publication 1766-RM001A-EN-P - October 2008

242 Application Specific Instructions

Any TDF instruction with a double word address computes the time

difference between 2 timestamps captured within 42949.67295 seconds of

each other (4294967295 10 µsec ticks). It calculates an invalid result if

more than 42949.67295 seconds have elapsed between the start and stop

timestamps.

This instruction shall do nothing on a false rung.

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Default Chapter5
- Table of Contents5
Preface13
- Common Techniques Used in this Manual15
- Purpose of this Manual15
- Who Should Use this Manual15
Chapter 1 I/O Configuration Embedded I/O16
- Related Documentation16
- Rockwell Automation Support16
I/O Configuration18
- Micrologix 1400 Expansion I/O19
- Micrologix 1400 Expansion I/O Memory Mapping20
- I/O Addressing29
- I/O Forcing31
- Input Filtering31
- Analog Inputs32
- Analog Outputs34
- Latching Inputs35
- Configure Expansion37
Controller Memory and File Types39
- Types Data Files40
Chapter 249
- Protecting Data Files During Download49
- Static File Protection51
- Password Protection52
- Clearing the Controller Memory53
- Allow Future Access Setting (OEM Lock)54
- Web View Disable54
- LCD Edit Disable55
Chapter 3 Function Files Overview58
Function Files58
- Real-Time Clock Function File59
- RTA - Real Time Clock Adjust Instruction61
- Memory Module Information Function File62
- Base Hardware Information Function File64
- Communications Status File65
- Ethernet Communications Status File82
- Input/Output Status File91
- Publication 1766-RM001A-EN-P - October92
- Instruction Set93
- Using the Instruction Descriptions94
Chapter 5 High-Speed Counter Overview101
- Programmable Limit Switch Overview101
- High-Speed Counter (HSC) Function File102
- High-Speed Counter Function File Sub-Elements Summary104
- HSC Function File Sub-Elements105
- HSL - High-Speed Counter Load132
- RAC - Reset Accumulated Value133
- Programmable Limit Switch (PLS) File134
Chapter 6141
PTO - Pulse Train Output141
- Pulse Train Output Function141
- Pulse Train Outputs (PTOX) Function File145
- Pulse Train Output Function File Sub-Elements Summary146
- PWM - Pulse Width Modulation160
- Pulse Width Modulation (PWMX) Function File161
- PWM Function161
- Pulse Width Modulated Function File Elements Summary162
XIC - Examine if Closed XIO - Examine if Open169
Chapter 7171
- OTE - Output Energize171
- OTL - Output Latch OTU - Output Unlatch172
- ONS - One Shot173
- OSR - One Shot Rising OSF - One Shot Falling174
Chapter 8177
- Timer Instructions Overview177
- TON - Timer, On-Delay181
- TOF - Timer, Off-Delay182
- RTO - Retentive Timer, On-Delay183
- How Counters Work184
- CTU - Count up CTD - Count down187
- RES - Reset188
Chapter 9192
Using the Compare Instructions192
- EQU - Equal NEQ - Not Equal193
- GRT - Greater than LES - Less than193
- GEQ - Greater than or Equal to LEQ - Less than or Equal to194
- MEQ - Mask Compare for Equal195
- LIM - Limit Test196
Math Instructions199
Chapter 10 Using the Math Instructions200
- Updates to Math Status Bits202
- Using the Floating Point (F) Data File203
- ADD - Add SUB - Subtract207
- DIV - Divide207
- MUL - Multiply207
- ABS - Absolute Value208
- CLR - Clear208
- NEG - Negate208
- SCL - Scale210
- SCP - Scale with Parameters211
- SIN - Sine213
- SQR - Square Root213
- COS - Cosine216
- TAN - Tangent218
- ASN - Arc Sine220
- ACS - Arc Cosine222
- ATN - Arc Tangent223
- DEG - Radians to Degrees225
- RAD - Degrees to Radians227
- LN - Natural Log229
- LOG - Base 10 Logarithm231
- XPY - X Power y233
- CPT - Compute236
Chapter 11239
- RHC - Read High Speed Clock239
- RPC - Read Program Checksum241
- TDF - Compute Time Difference242
Application Specific Instructions239
Chapter 12 Using Decode and Encode Instructions245
Conversion Instructions245
- DCD - Decode 4 to 1-Of-16246
- ENC - Encode 1-Of-16 to 4247
- Publication 1766-RM001A-EN-P - October247
- FRD - Convert from Binary Coded Decimal (BCD)248
- TOD - Convert to Binary Coded Decimal (BCD)252
- GCD - Gray Code255
Chapter 13 Using Logical Instructions257
- Updates to Math Status Bits258
- AND - Bit-Wise and259
- OR - Logical or260
- XOR - Exclusive or261
- NOT - Logical NOT262
Chapter 14 MOV - Move263
- MVM - Masked Move266
Chapter 15 CPW - Copy Word270
- Chapter 15 File Instructions CPW - Copy Word270
- COP - Copy File271
- FLL - Fill File273
- BSL - Bit Shift Left274
- BSR - Bit Shift Right276
- FFL - First In, First out (FIFO) Load279
- FFU - First In, First out (FIFO) Unload281
- LFL - Last In, First out (LIFO) Load284
- LFU - Last In, First out (LIFO) Unload286
- SWP - Swap288
Chapter 16 Sequencer Instructions SQC- Sequencer Compare290
Chapter 16 SQC- Sequencer Compare290
- SQO- Sequencer Output293
- SQL - Sequencer Load296
Chapter 17 JMP - Jump to Label299
- JSR - Jump to Subroutine300
- LBL - Label300
- SBR - Subroutine Label300
- RET - Return from Subroutine301
- SUS - Suspend301
- TND - Temporary End301
- END - Program End302
- MCR - Master Control Reset302
- Publication 1766-RM001A-EN-P - October303
Input and Output Instructions IIM - Immediate Input with Mask305
Chapter 18307
- IOM - Immediate Output with Mask307
- REF- I/O Refresh308
Chapter 19 Information about Using Interrupts309
Using Interrupts309
- INT - Interrupt Subroutine314
- User Interrupt Instructions314
- STS - Selectable Timed Start315
- UID - User Interrupt Disable316
- UIE - User Interrupt Enable317
- UIF - User Interrupt Flush318
- Using the Selectable Timed Interrupt (STI) Function File320
- Using the Event Input Interrupt (EII) Function File324
Chapter 20 The PID Concept331
Process Control Instruction331
- The PID Equation332
- PD Data File333
- PID - Proportional Integral Derivative334
- Input Parameters335
- Output Parameters339
- Tuning Parameters341
- Runtime Errors351
- Analog I/O Scaling352
- Application Notes353
- Application Examples358
Chapter 21 General Information363
- Instruction Types and Operation364
- Protocol Overview365
- String (ST) Data File366
- Control Data File367
- ACL - ASCII Clear Buffers369
- AIC - ASCII Integer to String370
- AWA - ASCII Write with Append371
- AWT - ASCII Write374
- ABL - Test Buffer for Line376
- ACB - Number of Characters in Buffer377
- ACI - String to Integer378
- ACN - String Concatenate380
- AEX - String Extract381
- Publication 1766-RM001A-EN-P - October382
- AHL - ASCII Handshake Lines383
- ARD - ASCII Read Characters385
- ARL - ASCII Read Line386
- ASC - String Search388
- ASR - ASCII String Compare389
- Timing Diagram for ARD, ARL, AWA, and AWT Instructions391
- Using In-Line Indirection391
- ASCII Instruction Error Codes392
- ASCII Character Set394
ASCII Instructions363
Communications Instructions Messaging Overview395
Chapter 22398
- SVC - Service Communications398
- MSG - Message400
- The Message Element401
- Timing Diagram for the MSG Instruction409
- Communication Servicing Selection and Message Servicing Selection412
- MSG Instruction Ladder Logic413
- Local Messages415
- Configuring a Local Message416
- Local Messaging Examples425
- Remote Messages441
- Configuring a Remote Message444
- Configuring a Multi-Hop Remote Message on Ethernet/Ip Communication Channel447
- Configuring a Micrologix 1400 CIP Generic Message Via Ethernet463
- MSG Instruction Error Codes468
- Special Function with MSG Instruction470
- Configure MSG Setup Screen to Send SMTP Message476
Chapter 23 Overview481
- Socket Interface Architecture481
- Communicate with the Socket Object Via a MSG Instruction487
- Programming Considerations491
- Socket Object Services493
- Possible Error Codes for Socket Services510
Chapter 24 RCP - Recipe513
- Data Logging520
- Queues and Records520
- Configuring Data Log Queues525
- Publication 1766-RM001A-EN-P - October526
- DLG - Data Log Instruction527
Micrologix 1400 Memory527
- Data Log Status File528
- Retrieving (Reading) Records530
- Accessing the Retrieval File531
- Conditions that will Erase the Data Retrieval File534
Chapter 25 LCD Overview535
- LCD Function File536
- LCD Function File Sub-Elements Summary537
- LCD Function File Sub-Elements538
- LCD - LCD Instruction544
Appendix A547
- Programming Instructions Memory Usage and Execution Time547
- Scan Time Calculation552
Appendix B Status File Overview554
- Status File Details555
- Identifying Controller Faults579
Appendix C Contacting Rockwell Automation for Assistance587
Appendix D Communication Protocol590
- DF1 Full-Duplex Protocol594
- DF1 Half-Duplex Protocol595
- DF1 Radio Modem Protocol606
- Modbus RTU Protocol613
- ASCII Driver625
- Ethernet Driver627
- Knowledgebase Quick Starts # 17444 "Quick Start" Pulse Train Output (PTOX)631
- 17446 "Quick Start" Pulse Width Modulation (PWMX)634
- 17447 "Quick Start" High Speed Counter (HSC)636
- 17465 "Quick Start" Message (MSG)640
- 17501 "Quick Start" Selectable Timed Interrupt (STI)644
- 17503 "Quick Start" Real Time Clock (RTC)646
- 17558 "Quick Start" User Interrupt Disable (UID)648
- 18465 "Quick Start" RTC Synchronization between Controllers649
- Publication 1766-RM001A-EN-P - October649
- 18498 "Quick Start" Data Logging (DLG)652
Appendix 26 Binary Numbers663
- Hexadecimal Numbers665
- Hex Mask667
Glossary669

Allen-Bradley MicroLogix 1400 - DCD - Decode 4 to 1-of-16

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