LOCALIZED HIGH-SPEED CONTROL
Enabling OSS2 on Pin 2 of the Smart Sensor connector gives system integrators access to localized highspeed control options; as already noted, OSS2 operates solely in SIO mode and may be designated as a input or an output channel. In addition to D2D communication (outlined above), two specific advantages stand out.
REPORTING TIME-CRITICAL EVENTS
Should a remote sensor identify an out-of-range parameter that requires immediate intervention, (for example, overheating), an event-based output signal is generated to notify the central control system – in the example shown, a PLC – that a system-wide shut-down is essential. In this instance, the IO-Link output (OSS1) may not respond quickly enough to prevent the problem escalating.
Using the SIO output on OSS2, the sensor delivers a high-speed notification directly to the PLC, bypassing the IO-Link channel and initiating the shut-down sequence immediately. The Smart Sensor’s dual-channel capability ensures that further, costly damage is avoided and that subsequent process down-time is minimized.
DECENTRALIZED CONTROL
Smart Sensors are also ideally suited to non-critical, decentralized process tasks under local control. In the example shown, a local SIO input signal on OSS2 enables or inhibits the operation of the sensor without the need to route the command via the PLC. This configuration consumes little or no system-wide resource, requiring only a confirmatory IO-Link signal on OSS1 to update the sensor status in due course. With OSS2 signal alternatively configured in output mode, the Smart Sensor may, for example, control the operation of a local sub-system, again without the need to route the command via the PLC. Using the signal to switch a simple two-state device allows the sensor to control the operation of any associated non-intelligent equipment, for example an actuator or an electrical circuit.
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