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5
5.1
The module base must be chosen to match the status of the field wiring; intrinsically safe
(IS) – blue module base, or general purpose (GP) – grey, see table below. The principle
distinction between the two is that the MTL4-BSIS and MTL4-BSISR terminal bases
contain the necessary diode and resistive components to provide the intrinsic safety
protection for the hazardous-area field wiring.
After that, the only choice to be made is whether the module base requires a relay for a
switched contact DO output.
Channel operation
DO - with switched contacts
12
INSTALLATION – MODULES
Terminals – pre-installation
(Zone 0, IIC, T4-6 hazardous
area if suitably certified)
AI
AO
DI
DO
Do not install IS and general-purpose terminal bases on the same carrier!
Terminal bases – by application
I.S. field wiring
MTL4-BSIS
MTL4-BSIS
MTL4-BSIS
MTL4-BSIS
MTL4-BSISR
WARNING!
General purpose field wiring
(Zone 2, IIC, T4-6 hazardous
area if suitably certified)
MTL4-BSGP
MTL4-BSGP
MTL4-BSGP
MTL4-BSGP
MTL4-BSGPR
INM MTL SUM5 Rev 1
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