I/O Terminal /
START-UP BEHAVIOR OF THE BUS COUPLER
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4
START-UP BEHAVIOR OF THE BUS COUPLER
This chapter describes the start-up behavior of the bus coupler.
4.1 Self-Test
Immediately after being switched on, the Bus Coupler checks, in the course of a self test, all
the functions of its components and the communication on the Standard-Bus. The red I/O
LED blinks while this is happening After completion of the self-test, the Bus Coupler starts to
test the attached Bus Terminals (the Bus Terminal Test), and reads in the configuration. The
Bus Terminal configuration is used to generate an internal structure list, which is not
accessible from outside. In case of an error, the Bus Coupler enters the STOP state. Once
the start-up has completed without error, the Bus Coupler enters the fieldbus start state.
The Bus Coupler can be made to enter the normal operating state by switching it on again
once the fault has been rectified.
