Enhanced IEC

Description

Enhanced IEC Overview

The following enhancements are available in Enhanced IEC mode:
• Introduction of fully tag-based addressing
• Increased Variable space – up to 128kBytes of variable storage – The current IEC system works by mapping allocated variables to the PLC %R space. At the time of development, the OCS was limited to 9999 %R’s. The Enhanced IEC development will remove the link between variables and %R’s and will simply allocate 128kBytes of variable storage – equivalent to 64000 %R registers.
• Reduced scan time
• More powerful Debugging and Simulation features – Breakpoints, Tracepoints can be set in the IEC logic files. Step in, step out and step over are available for IEC code. In simulation mode user can run the IEC program locally on the PC to test and debug during the development phase.
• Support for Online Logic Change – With the addition of online change in IEC the application running in the unit will never be interrupted, even when making updates. The logic running in the OCS can be modified without putting the unit to idle mode. This is ideal for programs which require long periods of start up or shut down so that logic changes can be made without waiting for the machine to start or stop so that logic can be downloaded.
• Introduction of Exception Handling – Allows user to trap errors which previously was difficult to find and frequently cause technical support calls
• Support for LREAL, LINT and LWORD Datatypes – Enhanced IEC mode supports LREAL (64-bit floating-point number), LINT (64 Bit Signed Integer) and LWORD (64 Bit Unsigned Integer) data types.
• Support of Bitfield – User can give meaningful name to every bits of a particular program variable
• Support of Enumerated Datatype – Added support to enumerated data types.

Enhanced IEC Features

• Enhanced IEC Settings and Data Types
• Bitfields
• Enumerated Data Type
• Structures
• Debugger Windows
• Breakpoints
• Tracepoints
• Call Stack Window
• Runtime Window
• On Line Change
• Simulation
• Stepping