Elements and Performance Criteria
- Prepare to develop industrial control systems programs.
- OHS procedures for a given work area are identified, obtained and understood through established routines and procedures.
- Established OHS risk control measures and procedures are followed in preparation for the work.
- Mode of operation of the control system is determined from job specifications of the process/plant/machine to be controlled, and through consultation with appropriate person(s).
- Equipment, software and testing devices needed to carry out the work are obtained and checked for correct operation and safety.
- Installation of programmable controller is checked for compliance with regulations and job specification.
- Develop and enter and programs for industrial control systems.
- Established OHS risk control measures and procedures for carrying out the work are followed.
- Control solutions are developed and documented based on the operational mode and using acceptable methods for designing control system that contain numeric variables and values.
- Developed control system is converted to an appropriate form, such as flow, state and ladder diagrams, using a personal computer and software applicable to the programmable controller into which the program is to be entered.
- Programming elements are written and used to manipulate word data. (See Note 1)
- Program control values are assigned using an applicable numbering system and code. (See Note 2)
- Programs are written to read and write analog signals offset using applicable software tools.
- Arithmetic functions are used to scale analog inputs to a specified span.
- Program is entered into the programmable control using a personal computer and appropriate software.
- Methods for dealing with unexpected situations are selected on the basis of safety and specified work outcomes.
- Monitor, verify and document programming activities.
- Device operation is tested in strict accordance OHS requirements and procedures.
- Entered instructions and settings are tested as meeting those specified for the control mode requirements.
- Appropriate methods and tools are used to test and monitor control programs and operating faults, anomalies are identified and rectified. (See Note 3)
- OHS work completion risk control measures and procedures are followed.
- Control system specification and program are documented in accordance with established procedures.
- Notes.1. Example of programming elements are loading data from discrete input switches to an internal register; manipulating internal registers using arithmetic, logical and other functions; driving outputs from internal registers; utilizing thumbwheel switches and displays; manipulating double registers with mathematical operations; loading constants, variables and presets in and out of memory; using masking of registers to obtain desired data; using tables for the storage of data.
- Examples are binary and signed binary, numbering systems and codes such as BCD or ASCII codes
- Examples of control program testing and monitoring methods and tools are locating status bits (flags); examining and modifying watchdog timer; investigating the implications of rung positioning in relation to scan.