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Programmable Safety Controller SCR P
8.18 Reference Signals
Important: The configuration software incorporates Reference Signals that represent the state of Safety
Controller outputs, input devices and both Function and Logic Blocks. A Safety Output reference signal
can be used to control another Safety Output. In this type of configuration, the physical On state of the
controlling Safety Output is not known. If the Safety Output On state is critical for the application safety,
an external feedback mechanism is required. Note that the safe state of this Safety Controller is when the
outputs are turned Off. If it is critical that Safety Output 1 is On before Safety Output 2 turns On, then the
device that is being controlled by the Safety Output 1 needs to be monitored to create an input signal that
can be used to control Safety Output 2. The Safety Output 1 reference signal may not be adequate in this
case.
Figure 98
on p. 108 shows how one Safety Output can control another Safety Output. When Manual Reset M0:MR1 is
pressed, it turns On Safety Output M0:RO2, which, in turn, turns On Safety Output M0:RO1.
108
Figure 98: Safety Output controlled by another Safety Output
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