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I've just acquired an Omron C200HS and I have to make a PID temperature control system. But I have only OC225 relay output unit. As I have
seen the PID(--) instriction outputs a hex. number, how it can be trensfered to cycle a relay in the O/P unit i.e. make a pulse width control with adjustable cycle time? Or I have to get some additional unit(s)? D/A converter is not acceptable because the control signal has to
drive an AC motor and so to open or close a valve and keep the temperature around the SP. The wear of the relay during proportional cycling
time souldn't ba a problem because the valve motor draws a relatevlly small current (0.4A).
Every idea is welcome.
Thanks in advance.
seen the PID(--) instriction outputs a hex. number, how it can be trensfered to cycle a relay in the O/P unit i.e. make a pulse width control with adjustable cycle time? Or I have to get some additional unit(s)? D/A converter is not acceptable because the control signal has to
drive an AC motor and so to open or close a valve and keep the temperature around the SP. The wear of the relay during proportional cycling
time souldn't ba a problem because the valve motor draws a relatevlly small current (0.4A).
Every idea is welcome.
Thanks in advance.