Operating Mode; Failure Behavior And Required Reaction; Safety/Integrity Requirements - JUMO Ex-i Safety Manual

6 Safety-related applications
6.5

Operating mode

Operating mode according to IEC/EN 61508: "low-demand mode" or "high-demand mode".
6.6

Failure behavior and required reaction

• The safe state is adopted when a line fault is detected or if the voltage supply fails.
• The safe state is achieved by disconnecting the connection terminals.
6.7

Safety/integrity requirements

Safety characteristics
• Type A device (according to IEC/EN 61508-1 and 61508-2)
• Safety integrity level (SIL) 2
• Systematic capability (SC) 2
• HFT 0
• Low-demand mode or high-demand mode
• MTTR = 24 h
• 1-channel: 1001 structure
• Ambient temperature 40 °C
• Mission time 10 years
• Proof test coverage (PTC) 99 %
List of configurations considered
Configuration Operation
C1
C2
C3
C4
C5
C6
C7
C8
22
Relay contact
Not inverted Normally closed
contact
Not inverted Normally closed
contact
Inverted Normally closed
contact
Inverted Normally closed
contact
Not inverted Normally open con-
tact
Not inverted Normally open con-
tact
Inverted Normally open con-
tact
Inverted Normally open con-
tact
Relay load
Load field IV, up to AC 250 V, 2 A or DC 30 V,
2 A resistive or weakly inductive load
(cos ɸ > 0.95)
Load field II, up to AC 120 V, 2 A resistive or
weakly inductive load (cos ɸ > 0.95)
Load field IV, up to AC 250 V, 2 A or DC 30 V,
2 A resistive or weakly inductive load
(cos ɸ > 0.95)
Load field II, up to AC 120 V, 0.2 A resistive or
weakly inductive load (cos ɸ > 0.95)
Load field IV, up to AC 250 V, 2 A or DC 30 V,
2 A resistive or weakly inductive load
(cos ɸ > 0.95)
Load field II, up to AC 120 V, 0.2 A resistive or
weakly inductive load (cos ɸ > 0.95)
Load field IV, up to AC 250 V, 2 A or DC 30 V,
2 A resistive or weakly inductive load
(cos ɸ > 0.95)
Load field II, up to AC 120 V, 0.2 A resistive or
weakly inductive load (cos ɸ > 0.95)