Fail-safe inductive sensors - System description
- Certified to EN 954-1, category 4 PDF-M to EN 60947-5-3.
- Safety monitoring of persons and machines.
- No coded target required for electronic fail-safe sensors.
- Connection of the sensors to safety plc or AS-i module G1506S.
- Series connection of sensors and contacts.
Safety technology in automation has a share of the responsibility for safe human-machine interaction. Fail-safe sensors with safety functions are one important part of a safety system for persons and machines. For the first time, the operating principle and thus the advantages of inductive sensors can also be used for safety applications. Direct detection of metal solves new applications. Up to now magnetic or mechanical counterparts had to be considered in the design. Wear-free function due to the non-contact principle and a high protection rating guarantee high uptime of the machines and installations.
Connection and evaluation
No special demands such as shielding, twisted cables or separate laying, are placed on the socket. The sensor is directly connected to existing plcs or logic modules using common unscreened 4-core cables. The input and output signals of the sensors correspond to DIN EN 61131-2 and are therefore fully compatible with the inputs and outputs of a plc. The connection to ifm evaluation relays, the bus system AS-i Safety at Work, PROFIsafe, Interbus Safety or safe plcs and logic modules is equally simple. For the unit family with dynamic pulse detection the corresponding software modules are required. The fail-safe sensors with 2 x PNP output can be connected to approved two-channel evaluation units without cross-monitoring that are suitable for plus-switching non-contact guards. The evaluation units from ifm electronic enable functionalities such as muting or connection of e-stop devices to DIN EN 60947-5-1 without extra cost.
Operating principle of intelligent electronic fail-safe sensors
A magnet or coded target is no longer necessary for the function of the fail-safe sensor. The fail-safe inductive sensor detects metals such as stainless steel or mild steel. The fail-safe sensor operates with an enable zone which is monitored for target position and dwell time.