Data Logging | Food Safety | OEM Development

PLC Programming with the Hawk-Eye 800

The Hawk-Eye 800 is a web-enabled paperless chart recorder and multi loop controller with a suite of new features designed to deliver critical plant information to the owner and associated maintenance crew in easy to read format. For a quick overview of the features and benefits of the Hawk-Eye 800 see the video here.

But did you know that the Hawk-Eye 800 also includes an easy to program PLC that can be used to turn motors on and off, open and close valves and generally control your plant?

That’s right, if you use a Hawk-Eye 800 to do your measurement monitoring and control, you can probably do away with additional PLC’s to do the sequencing and control.

The logic system developed for the Hawk-Eye is so simple to use that even people with no PLC training at all can master it with less than an hour’s training.

Real world Digital inputs and outputs and soft digital inputs and outputs (flags) follow a very simple numbering system.

PLC Programming in the Hawk-Eye 800

Entering the Logic Sequence is Easy

Here is a list of the logic blocks and functions built into the Hawk-Eye 800. Using these functions you can create a ladder logic diagram. Just call up the functions one row at a time in a sequence and enter the inputs and time delays. The output numbers are already defined for you,  making it even easier to configure

  • Pulse Width Timers. These set the on/off time of the output in proportion to any analogue signal. The time base can be set from 1 second upwards.
  • Monostable timers. One input is used to trigger and the other to reset. The timer output remains true for the time out period which can be 1 second upwards.
  • Delay On Timers. The output becomes true provided the input remains true for the timeout period. After that the output will remain true while the input is true and will reset when the input resets.
  • Delay Off Timers. The output turns off provided the input remains off for the timeout period. After that, the output will remain off until the input turns on
  • Inverters. The output always is the opposite state to the input
  • Input logic Gates (AND, NAND, OR, NOR, XOR, XNOR) each with 4 inputs. These gates follow the Boolean logic of the standard functions. Any input can be forced off or on
  • Run timers. This timer measures the time an input has remained on and once that time equals the run time, the output turns on
  • Event counters. The number of events are counted and when they equal the preset count, the output turns on.
  • Flag to Flag links. Used to link flags together for example to link the output of a timer to an email triggering flag.
  • Flag to Relay links. These are used to turn on relays when a particular flag is on.
  • Email triggering flags. The email triggering flags allow you to send an email to any number of recipients when a digital event occurs such as the activation of an emergency switch.
  • Touchscreen push-buttons.  The touch screen push-buttons sit behind the dashboard flags so you can manually signal an event to the logic such as starting a process.
  • User labelled Dashboard Flags. The user labelled flags provide a visual indication on the dashboard that some digital conditions are true.


Once you have entered the sequence, save it and you are ready to control your plant.