MODULAR SAFETY INTEGRATED CONTROLLER MOSAIC
8540780 • 10/07/2020 • Rev.38 39
OSSD (M1, MI8O2, MO2, MO4)
The M1, MI8O2, MO2, MO4 modules are equipped with OSSD (static semiconductor safety
outputs) dual channel. These outputs are short circuit protected, cross circuit monitored
and supply:
• In the ON condition: (Uv-0,75V) ÷ Uv (24VDC ± 20%)
• In the OFF condition: 0V ÷ 2V r.m.s.
The maximum load of 400mA@24V corresponds to a minimum resistive load of 60.
The maximum capacitive load is 0.68 F. The maximum inductive load is 2 mH.
External devices cannot be connected to the outputs unless explicitly planned in the
MSD program configuration.
OSSD (M1S, MI8O4, MO4L)
The M1S, MI8O4, MO4L modules are equipped with OSSD (static semiconductor safety outputs)
single channel. These outputs are short circuit protected, cross circuit monitored and supply:
• In the ON condition: (Uv-0,75V) ÷ Uv (24VDC ± 20%)
• In the OFF condition: 0V ÷ 2V r.m.s.
The maximum load of 400mA@24V corresponds to a minimum resistive load of 60.
The maximum capacitive load is 0.82F. The maximum inductive load is 2 mH.
Different output configurations (configurable with MSD configuration software)
can be set:
• 4 single channels (1 Safety Output per channel with its relative feedback input).
• 2 dual channels (2 Safety Outputs per channel with their relative feedback input).
• 1 dual channel and 2 single channels.
Using single channels OSSD, to maintain Safety Integrity Level (SIL) "3" requirements the OSSD
outputs must be independent.
Common cause failures between OSSD outputs must be excluded by observing an appropriate
cable installation (i.e. separate cable paths).
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