Watlow’s EZ-Zone™ RM integrated multi-loop controller family offers products that simplify thermal system management. The RM family is comprised of eight module types: an integrated On/Off/PID control, monitoring and over/under temperature limit module (RMC), a high-density On/Off/PID control module (RMH), a high-density limit only module (RML), an input/output “I/O” expansion module (RME), a high-density monitor/scanner module (RMS), two data logging and field communications access modules (RMA & RMAP) and a fiber optic sensing module with control loops (RMF). A system is configured by connecting any combination of module types to address specific application needs. The RM is extremely flexible and scalable allowing you to mix and match I/O to configure 1 to 152 control loops and up to 256 monitor points. Because the EZ-Zone RM controller is single-loop scalable, you only pay for what you need–leading to exact loop count and unmatched industry flexibility.


Current lead time is 5-7 days, FOB: Winona, MN.

RMC Control Module Build-A-Product
RME Expansion Module Build-A-Product
RMA Access Module Build-A-Product
RMAP PLUS Access Module Build-A-Product
RMH High-Density Control Module Build-A-Product
RML Limit Module Build-A-Product
RMS Scanner Module Build-A-Product
RMF Fiber Optic Sensing Module Build-A-Product
Watlow EZ-Zone RUI Remote User Interface


Optional integrated controller functions that can be combined together or ordered in different quantities as desired include:

  • PID Control Loops
  • Over/under temperature limit control loops
  • 10 or 15 ampere power output/heater driver options
  • On-board data logging
  • Current measurement input
  • Sequencer start up and control function
  • Programmable timer and counter functions
  • Programmable math and logic options
  • Multiple communication protocol options
  • Mobile configuration with removable secure digital (SD) flash card

Features and Benefits

  • Integrated & PID Limit Controller
    • Reduced wiring time and termination complexity compared to connecting discrete products
    • Improves system reliability
    • Reduces termination and installation costs
    • Eliminates compatibility issues often encountered with using many different discrete components and brands
    • Reduces troubleshooting time and downtime costs since the system can specifically identify to the operator any problems with a sensor, controller, solid state relay (SSR) power output or heater load
    • Thermal solution is complete–saving engineering time and labor costs while speeding up project times
  • 1 to 152 PID Loop Controller or Monitor up to 256 Analog Inputs
    • Mix and match I/O to suit the application; from 1 input with 2 outputs to 152 analog inputs with 152 outputs. Or monitor up to as many as 256 analog inputs all in one system
    • Saves money because only needed loops are purchased
    • Allows a common controller platform across many design applications since both loop count and additional outputs can be ordered in increments of one
  • Advanced PID Control Algorithm
    • Offers TRU-TUNE+ adaptive control to provide tighter control form demanding applications
    • Enables auto-tune for fast, efficient start up
  • Communications Capabilities
    • Provides a wide range of protocol choices including Univeral Series Bus (USB) device port, Modbus RTU, Ethernet/IP™, Modbus TCP, DeviceNet™ and ProfiBus
  • USB Port
    • Provides data log retrieval
  • SPLIT-RAIL™ Control
    • Allows mounting of low voltage and high voltage modules in different cabinets with individual modules functioning together even if physically split apart
    • Minimizes the length and cost of wire runs and improves system reliability by accommodating inputs located closer to sensors and outputs closer to loads
    • Saves time by reducing complexity and automatically configures a new module with the same parameter settings as the replaced module
    • Prevents customer system shutdown and product scrap or loss by allowing a sensor to be chosen to backup another sensor in case of primary sensor failure

System Component Modules

  • Control Module (RMC) – Temperature / Limit Suite
    • Populate 1 to 4 loops with 1 universal input and 1 to 2 outputs
    • Low voltage (24V ac/dc) power supply input
  • High-Density Module (RMH) – Temperature Suite
    • Populate 4 to 16 loops with universal input and user-selectable output
    • Low voltage (24V to 28V ac/dc) power supply input
  • High-Density Limit Module (RML) – Limit Suite
    • Populate 4 to 12 safety limits with universal input and user-selectable output
    • Low voltage (24V to 28V ac/dc) power supply input
  • Expansion Module (RME) – Input / Output Suite
    • Low Density Outputs – Switch dc, open collector, mechanical relay, SSR, NO-ARC, analog V, analog mA
    • High Density Outputs – 6 digital inputs and outputs, 4 mechanical relays, two 10A SSRs
  • High-Density Scanner Module (RMS) – Monitor Suite
    • Populate 4 to 16 universal inputs without control loops
    • Low voltage (24V to 28V ac/dc) power supply input
  • Access Module (RMA) – Communications/Data Logging Suite
    • Communications
    • Real time clock and battery back-up
    • System configuration memory
    • USB port (mass storage device)
    • On-board data logging
  • Basic Remote User Interface (RUI) – optional
    • 1/16 DIN, dual 4-digit display
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