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Omron E5AC-CX3ASM-804 — front view of the 96×96 mm black housing showing the large white 25 mm PV display, the secondary SV/status row, and the model label

Omron E5AC-CX3ASM-804 — 96×96 PID Temp Controller, RS-485

SKU: E5AC-CX3ASM-804

USD 68.00

E5AC-series 96×96 mm PID temperature controller, universal input, linear 4-20 mA output, RS-485, 3-point aux output, AC100-240 V.

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Product Overview

The Omron E5AC-CX3ASM-804 is a digital PID temperature controller in the 96×96 mm E5AC family, sized for panel cutouts where a larger, easy-to-read display matters. The E5AC-800 generation uses a 25 mm-tall white PV display so process values stay readable from across the cabinet. It accepts a universal input — thermocouple, Pt100, ES1B infrared, or analog (4-20 mA, 0-20 mA, 1-5 V, 0-5 V, 0-10 V). Control output 1 is linear 4-20 mA for a thyristor or analog-driven actuator. Three relay auxiliary outputs handle alarms, two event inputs accept external switches (RUN / STOP, manual / auto, remote SP), and RS-485 communication is fitted. It is the standard pick for panel temperature control on plastic or heat-treat lines where analog control and a PLC link are both needed.

Where it fits in the E5_C family

The E5_C family splits by size. The E5CC is the 48×48 mm version, the E5EC is the 48×96 mm version, and the E5AC is the 96×96 mm version. Within the E5AC-800 series, E5AC-CX3ASM-804 is the linear-output 3-point RS-485 AC100-240 V variant with 2 event inputs. E5AC-CX3ASM-808 adds heater-burnout detection. E5AC-CX3ASM-810 adds 4 event inputs and 4 auxiliary outputs. E5AC-CX3DSM-804 is the same controller on AC/DC 24 V supply. Pick the E5AC-CX3ASM-804 when linear current output, RS-485 to a PLC, and an AC-supply panel are the goal.

Why linear output rather than relay

Relay outputs switch ON/OFF, which causes process oscillation on fast heaters. A linear 4-20 mA output drives a thyristor (e.g., the G3PX series) in proportion to PID demand, so a 200 W and a 20 kW heater both run with the same control stability. Three relay auxiliary outputs handle alarms; use the event inputs for a panel-mounted RUN/STOP key and an auto/manual selector.

Before ordering

Confirm the input matches the field sensor — TC polarity, 2-wire / 3-wire RTD, or analog loop. Wire event inputs with dry contacts or PNP drivers per the manual. Set RS-485 to 9600 or 19200 bps half-duplex with a unique unit number before connecting to a CP1L / CP2E / NJ PLC. Use CX-Thermo (free tool) via the front port for setup and auto-tuning.

Key Features

  • E5AC family 96×96 mm PID temperature controller
  • Universal input: TC (K/J/T/E/L/U/N/R/S/B/W), Pt100, ES1B, 4-20 mA, 0-10 V
  • Linear 4-20 mA control output for thyristor or analog actuator
  • Three relay auxiliary outputs, two event inputs
  • RS-485 serial communication, CompoWay/F protocol
  • 50 ms sampling period for fast-loop response
  • 25 mm-tall white LCD PV display
  • AC100-240 V supply, 9.0 VA
  • SKU: E5AC-CX3ASM-804
  • Series: E5AC 96×96 mm PID temperature controller
  • Voltage: 240 V
  • I/O: 100 I/O

Best-Fit Applications

  • Extruder barrel and die temperature control on plastics lines
  • Furnace and oven zone control on a heat-treat line
  • Tank and reactor temperature control in process plants
  • Thyristor-driven electric heater control via 4-20 mA demand
  • PLC linkup for status and parameter change via RS-485

Buying Checklist

  • Choose E5AC-CX3ASM-804 for linear 4-20 mA output and RS-485 on AC100-240 V.
  • Choose E5AC-CX3ASM-808 when heater-burnout detection is required.
  • Choose E5AC-CX3ASM-810 for 4 event inputs and 4 auxiliary outputs.
  • Choose E5AC-CX3DSM-804 for the same controller on AC/DC 24 V supply.
  • Choose E5CC-QX2ASM-800 for a 48×48 mm panel when the larger cutout is not needed.
  • Confirm the sensor type (TC, RTD, analog) matches the field wiring.

Technical Specifications

Series E5AC 96×96 mm PID temperature controller
Size 96 × 96 × 60 mm (1/4 DIN), panel cutout 92 × 92 mm
Supply Voltage AC100-240 V, 50/60 Hz
Power Consumption 9.0 VA max. at AC100-240 V
Sensor Input Thermocouple (K/J/T/E/L/U/N/R/S/B/W), Pt100/JPt100, ES1B, 4-20 mA / 0-20 mA / 1-5 V / 0-5 V / 0-10 V
Sampling Period 50 ms
Control Output Linear current 4-20 mA / 0-20 mA, load ≤500 Ω
Auxiliary Outputs 3 × SPST-NO, AC250 V 3 A resistive
Event Inputs 2 external contact / transistor inputs
Communication RS-485, CompoWay/F, terminal block
Control Modes ON/OFF or 2-DOF PID with auto-tuning, standard or heat/cool
Operating Temperature -10 to +55 °C

FAQ for E5AC-CX3ASM-804

What is the difference between E5AC-CX3ASM-804 and E5AC-CX3ASM-800?
Both are 96×96 mm E5AC controllers with linear current control output and AC100-240 V supply. E5AC-CX3ASM-800 has no communication and no event inputs. E5AC-CX3ASM-804 adds RS-485 communication and 2 event inputs. Pick -804 when a PLC link or remote auto/manual switch is part of the job; pick -800 when the controller stands alone.
What sensor inputs does E5AC-CX3ASM-804 accept?
It accepts any thermocouple type in the E5_C list (K, J, T, E, L, U, N, R, S, B, W), Pt100 or JPt100 RTD in 2- or 3-wire, the ES1B non-contact infrared sensor, or a 4-20 mA / 0-20 mA / 1-5 V / 0-5 V / 0-10 V analog signal. Switch between them in the parameter menu, so one controller can run different zones on the same machine.
How does the linear 4-20 mA output wire up?
The linear output terminal drives a thyristor (G3PX series, E5CK-T / G3PW, etc.) with a 4-20 mA loop, with the load resistance held below 500 Ω. It is the right pick for proportional control of electric heaters, where ON/OFF relays cause process cycling. Use the auxiliary relay outputs for alarm signalling, not for proportional load switching.

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