STO1726KO1
Schneider Electric STO1726KO1 Safety Output Module (Modicon M340 PLC Safety Relay Unit)
Product Description
The STO1726KO1 is a safety output module designed for Schneider Electric’s Modicon M340 PLC system, specialized in controlling safety-related actuators in industrial machinery while ensuring compliance with international safety standards (EN ISO 13849-1 PLd, EN 62061 SIL 2). Its core function is to switch power to critical actuators (such as emergency stop relays, safety gate locks, or machine brakes) in response to signals from safety controllers, ensuring rapid and reliable shutdowns when hazardous conditions are detected. It is widely used in applications like packaging machines, material handling systems, and small-scale robotic cells—for example, activating a brake on a conveyor belt within 10ms if a safety light curtain is breached, preventing operator contact with moving parts.
Featuring 6 safety output channels, the module utilizes forced-guided relays (also known as “positive-guided” relays) to ensure that contacts cannot remain closed due to mechanical failure (e.g., welds or jams). Each channel supports 24V DC/5A or 250V AC/3A loads, making it compatible with both low-voltage actuators (e.g., 24V DC solenoid locks) and high-voltage devices (e.g., 230V AC motor contactors). The channels are divided into three independent pairs, allowing redundant control of critical actuators—for instance, a robotic arm’s emergency stop circuit can use two pairs to power separate brake coils, ensuring the arm stops even if one coil fails.