Why are PID parameters set with relay output?

It's time proportional PID. That means that in addition to relay output, it can support TRIAC and voltage output. With time proportional output, control calculation result is output using the pulse width of an ON/OFF signal proportional to time. The pulse width is calculated by the following formula with the cycle time (control output period) being 100%.
Control output pulse width = control output (%) x cycle time

Related Products & Solutions

Advanced Application UT75A

The UT75A temperature controllers employ an easy-to-read, 14-segment large color LCD display, along with navigation keys, thus greatly increasing the monitoring and operating capabilities. A ladder sequence function is included as standard. The short depth of the controller helps save instrument panel space. The UT75A also support open networks such as Ethernet communication.

Mid-level UT55A/UT52A

The UT55A and UT52A temperature controllers employ an easy-to-read, 14-segment large color LCD display, along with navigation keys, thus greatly increasing the monitoring and operating capabilities. A ladder sequence function is included as standard. The short depth of the controller helps save instrument panel space. The UT55A/UT52A also support open networks such as Ethernet communication.

UP35A/UP32A

The UP35A is a program controller with available 4 patterns and 40 segments (max.) and multi-channel contact I/O. It also includes a ladder sequence function. The UP32A is a compact program controller with up to 4 patterns and 40 segments available. It also includes a ladder sequence function.

UP55A

The UP55A is a newly-released 1/4 DIN sized program controller provides up to 30 program patterns, and simultaneous monitoring of 8 PV events, 16 time events, and 8 alarms. Also a ladder sequence function is included as standard.

UT32A-D

The UT32A-D is a compact digital indicating controller with selectable 2-loop control. It also includes a ladder sequence function.

UT35A/UT32A

The UT35A and UT32A temperature controllers employ an easy-to-read, 14-segment large color LCD display, along with navigation keys, thus greatly increasing the monitoring and operating capabilities. A ladder sequence function is included as standard. The short depth of the controller helps save instrument panel space. The UT35A/UT32A also support open networks such as Ethernet communication.

Top