PL7 and Control Expert Timers Comparison
Original instructions
About us
Introduction
This part explains the differences between the PL7 timers and IEC timers available in Control Expert. Those differences are useful especially when migrating from PL7 software to Control Expert.
The PL7 timers include:
The IEC timers include:
IEC timers and PL7 timers comparison
The table below lists the differences between IEC timers and PL7 timers:
IEC Timers
PL7 Timers
Allowed amount of timers in application
Unlimited
255
Programming
  • No time base
  • Preset time is a TIME type (t#1mn20s)
  • The current value of the timer is directly one output ET of TIME type
  • Time base (min, sec, or ms) must be defined with an integer
  • The preset time is an INT type (time base factor)
  • The current value is provided by a public variable
Running Mode
The TON instance must be scanned in the program to refresh the output
The output is set once the timer is launched
Online Mode
Online modifications (add/modify) allowed on TON instance
The user cannot:
  • Modify the time base
  • Create new instance