OSSD (MO4LHCS8)
MO4LHCS8 provides 4 independent High Current Safety Outputs OSSD (2A max per
channel). These outputs are short circuit protected, cross circuit monitored and supply:
• In the ON condition: (Uv-0,6V)...Uv (24VDC ± 20%)
• In the OFF condition: 0V...2V r.m.s.
The maximum load of 2A@24V corresponds to a minimum resistive load of 12.
The maximum capacitive load is 0.82F. The maximum inductive load is 2.4 mH.
Different output configurations (configurable with MSD configuration software) can be set:
• Four single safety outputs with related feedback inputs.
• Two dual-channel safety outputs with related feedback inputs.
• One dual-channel safety output and two single safety outputs with related
feedback inputs.
Two OSSDs configured as a single output cannot be linked together to make a dual-channel safety
output. Dual-channel safety outputs must always be realized through the MSD software.
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).
Using MO4LHCS8 with sum output current > 5 A, then separate adjacent modules by interposing
a MSC connector.
➔
External devices cannot be connected to the outputs unless explicitly planned in the MSD
program configuration.
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