HONEYWELL SDO-0824 FC-SDO-0824 output module

The safe state of an input is indicated by a 0 signal being passed to the user program. If the test routines detect a fault in the digital inputs, a 0 signal is processed in the user program for the defective channel. When a fault occurs, the inputs are switched off (0) and the FAULT indicator is activated. Follow the closed-circuit principle for external wiring when connecting sensors. To create a safe state in the event of a fault, the input signals revert to the de-energized state (0). Although the external line is not monitored, a wire break is interpreted as a safe 0 signal.Line control is a short-circuit and line-break monitoring system, for example, E-stop inputs that can be configured for the GuardPLC system. Up to eight digital outputs (DO1…DO8) can be configured as pulsed outputs. The example below shows two pulse outputs connected to the digital inputs (DI) of the same system. As a result, the connections to the digital inputs (DI) are monitored.

Inputs are set to 0, a fault code is generated

 and the FAULT status indicator is on when: 

• a short-circuit occurs between two parallel connections.

 • two connections are reversed.

 • earth fault occurs on one of the lines (only with earthed reference pole). 

• a line breaks or one of the contacts opens (that is, when one of the E-stop off switches is pressed in the example above)

Safety-related Digital Outputs

 The module has eight digital outputs (DO1…DO8) whose status is indicated via status indicators. An output is in a safe state when it is de-energized. If a fault occurs, all outputs are turned off. Outputs 1…3 and 5…7 can have a load of 0.5 A at an ambient temperature of 60 °C (140 °F). Outputs 4 and 8 can each have a load of 1 A at an ambient temperature of 60 °C (140 °F), or up to 2 A at an ambient temperature of 50 °C (122 °F). With an overload, one or all of the outputs are turned off. When the overload is eliminated, the outputs are activated again according to the specified value. Although the external line of an output is not monitored, a short-circuit will be indicated.

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