As little as 20 years ago, relay logic was the industry standard. Today, PLC's have taken over. These sophisticated programmable logic controllers are capable of functions unachievable by simple relay logic. But, to truly harness the power of today's PLC based systems, they must be used in conjunction with an HMI (human machine interface).
At HydroFlo, we design our HMIs so that they are intuitive to the process. All of the screens and operations are laid out in a logical "common sense" format so that the operator is not lost in a confusing jumble of screens and processes. The individual screens are broken down showing individual aspects of the overall system, as well as their relationship with ancillary systems or processes. P&IDs, as well as process controls, parameter entry, system alarms and maintenance screens all inter-relate in a user friendly fashion. When an alarm sounds, the screen alerts the operator to the specific alarm situation, as well as any items that may be contributing to the alarm situation.
There are many things to consider when designing an HMI (human-machine interface). HydroFlo’s goals are to maximize efficiency and ease-of-use and minimize system downtime.