The Emerson VersaMax Micro 64 is the largest controller in the VersaMax Micro compact PLC family, packing 40 DC inputs and 24 DC outputs into the base unit — the highest built-in I/O count in the series. With 24K words of logic memory, 32K words of data storage, and 100kHz 32-bit high-speed counters, it handles complex machine control applications that would otherwise require a modular PLC.

How does the Micro 64 extend beyond the Micro 40?

The Micro 64 adds 16 more inputs and 8 more outputs over the Micro 40 — enough to eliminate an expansion module in many designs. Both share the same 100kHz HSC, 65kHz PWM, and motion command set (Find Home, Go Home, Jog, Ramp, Blended Move). Both support online program editing (Firmware 3.9+, Hardware Rev B+), allowing logic changes without stopping the machine. The key difference is built-in I/O density: 64 points on the base unit versus 40, reducing panel space and wiring for I/O-heavy machines like packaging equipment, small assembly cells, and pump skids with extensive valve and sensor counts.

What expansion and networking options are available?

Up to four expansion modules — discrete I/O, analog I/O, RTD/thermocouple, or the IC200UMM002 2-axis motion module — extend the system to 176 total I/O points. The optional second communication port can be factory-configured for RS-232, RS-485, USB, or Ethernet, providing HMI connectivity and Modbus RTU SCADA integration alongside the programming port. A real-time clock with battery-backed RAM preserves timestamps, recipes, and production data across power cycles. Programming is via Emerson's Machine Edition in ladder diagram or instruction list.