Fuji PXR4TAY1-5W000-C Temperature Controller, PV 13mm SV 11m

RS485 communication supports both the MODBUS protocol and Fuji's original Z-ASC protocol, selectable in configuration. This matters for a controls integrator planning a retrofit: if the existing line uses MODBUS RTU, the PXR4TAY1-5W000-C drops in without a gateway; if the site has a legacy Fuji network on Z-ASC, it speaks that natively. No protocol converter needed either way. The heater break alarm is a safety-relevant feature that detects open-circuit conditions in the heater load before the process drifts. For a validation engineer qualifying a sterile-fill suite, this alarm provides an auditable event in the controller's fault log — supports the change-control boundary between process upset and hardware failure. The multiple alarm function can delay action, switch between excitation and non-excitation, and lock combinations. For a panel builder wiring a safety-related overtemperature shutdown, the non-excitation (fail-safe) mode ensures the alarm relay de-energizes on sensor break — the same logic used in burner-management circuits. A digital input allows an external switch to set the SV (set value) or trigger other events. This lets a site electrical engineer wire a remote selector switch for recipe changeover without opening the controller's front panel — useful in cleanroom environments where panel access is restricted.