Elements and Performance Criteria
- Prepare to develop enter and verify program.
- 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.
- Safety hazards that have not previously been identified are reported and advice on risk control measures is sought from the work supervisor.
- Control system scenario 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 control system and enter and test program.
- Established OHS risk control measures and procedures for carrying out the work are followed.
- Circuits/machines/plant are checked as being isolated where necessary in strict accordance OHS requirements and procedures.
- Control solutions are developed and documented based on the specified control mode and using acceptable methods for designing control systems.
- 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. (See Note 1)
- Program is entered into the programmable control using a personal computer and appropriate software.
- Entered instructions and settings are tested as meeting those specified in by the control system scenario.
- Appropriate methods and tools are used to test control systems and operating faults and anomalies are identified and rectified. (See Note 2)
- Methods for dealing with unexpected situations are selected on the basis of safety and specified work outcomes.
- Verify, document and report programming activities.
- OHS work completion risk control measures and procedures are followed.
- Program is transferred from a programmable controller to an external medium for storage. (See Note 3)
- Control system specification and program are documented in accordance with established procedures.
- Work completion is reported and appropriate personnel notified in accordance with established procedures.
- Note.1. Example of control functions are derived timers (off delay, self resetting, constant duty cycle), reversible counters, cascading timers, cascading counters, combining timers and counters, internal relays/flags/markers, latching relays (set/reset), jump instructions, master control instructions, bit shift registers, scan time considerations, one shot, retentive (power fail) functions, simple step sequence instructions
- Examples of control system testing methods and tools are monitor mode as an aid to fault finding, inbuilt hardware/software diagnostics and use of error codes.
- Examples of storage mediums are IC storage, hard disks, servers .