Festo CMMO-ST-C5-1-DIOP Stepper Motor Controller

Technical Overview

24VDC stepper motor controller featuring PNP switching, Modbus TCP, Ethernet interfaces, and Safe Torque Off (STO) SIL 3. Delivers 5.7A nominal output current.

Key Features

Provides precise open-loop and closed-loop position control with a built-in PI speed controller for 2-phase stepper motors.
Supports Modbus TCP and Ethernet TCP/IP for seamless automation integration and parameterization via the Festo Configuration Tool (FCT).
Integrated Safe Torque Off (STO) safety function, compliant with SIL 3 (EN 61800-5-2) and PL e (EN ISO 13849-1).
Features 11 digital PNP inputs and 11 PNP outputs (24VDC), enabling reliable operation in complex motion applications.
Compact IP40 housing (115 x 39 x 118.7 mm) designed for standard DIN rail or flat mounting plate installation.

Technical Specification Matrix

Parameter	Value
Supply Voltage	24 VDC
Max Intermediate Circuit Voltage	28 VDC
Nominal Output Current	5.7 A
Peak Load Supply Current	8.0 A
Switching Logic	PNP
Digital Inputs/Outputs	11 PNP Inputs, 11 PNP Outputs
Communication Interfaces	Ethernet (TCP/IP), Modbus TCP
Safety Function	Safe Torque Off (STO) SIL 3 / PL e
Protection Class	IP40
Ambient Operating Temperature	0°C to 50°C
Physical Weight (kg)	0.29
Dimensions L x W x H (cm)	11.5 x 3.9 x 11.87

Industrial Applications

1. Automated Packaging Machinery

Controls stepper motors to precisely index and position packaging materials, ensuring accurate cutting, sealing, and material feeding operations.

Problem Solved

Eliminates positional drift and synchronization errors in high-speed packaging lines using integrated PI closed-loop control and fast PNP I/O.

Closed-Loop ControlStepper MotorHigh-Speed I/OPosition Control

2. Robotic Assembly Stations

Drives multi-axis stepper systems for pick-and-place arms or rotary indexing tables used in electronic component assembly and testing.

Problem Solved

Ensures critical operator safety during maintenance or fault events without disconnecting main power via the integrated SIL 3 Safe Torque Off (STO) function.

Safe Torque OffSIL 3Modbus TCPMulti-Axis Sync

3. Lab Automation & Fluid Handling

Operates precise linear actuators and rotary drives for dispensing, pipetting, and transporting sensitive fluid samples in automated diagnostics.

Problem Solved

Maintains smooth, vibration-free motion and exact dosing volumes through micro-stepping parameterization and robust encoder feedback loop integration.

Micro-SteppingPI Speed ControllerEncoder FeedbackPNP Logic