If you are looking for a bit that is true for the first scan of the processor and then false, there is no system tag that has this characteristic. However, you could create one by setting a bit high in a Power-Up task (which runs once before the first scan of the main program) and then setting the bit low at the end of the main program cycle.
More information on logic blocks and execution style can be found in the MAPware-7000 IEC61131 Programming Guide.
Software Downloads & Upgrades
Manuals & Guides
- HMC Series Installation Guide
- MAPware-7000 Programming Manual
- MAPware-7000 Ladder Logic Guide
- Mapware-7000 Getting Started Guide
- HMC3000 I/O Module Guide
- HMC7000 I/O Module Guide
- MAPware-7000 IEC61131 Programming Guide
Videos
- Part 1: Introduction and Installation
- Part 2: Creating a Native Ladder Project
- Part 3: Adding and Initializing Tags
- Part 4: Adding Logic
- Part 5: Creating an HMI Screen
- Part 6: Duplicationg an HMI Screen
- Part 7: Downloading and Testing the Project
- Part 8: Creating an IEC Project
- Part 9: Creating a UDFB
- Part 10: Adding a Structure Text UDFB
- Part 11: Adding Power Up and Main Routine Logic
- Part 12: Creating Screen Objects
- Part 13: Downloading the Project and Online Monitoring
Sample Projects