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23
INM MTL SUM5 Rev 1
6.5 Analogue output (AO)
Terminals B+ and C- are used to accept the 4-20mA signal from the control system. The
current is repeated into the hazardous area through terminals 4+ and 2-.
Figure 6.5
- Analogue output options
6.6 Bypass module
The MTL4-BYP module can provide a pass-through function in the same body package
as the MTL4-ADIO. When necessary, this is able to provide direct ‘through’ wiring in the
manner shown in the table below.
Field wiring
To
Control wiring
1 & 4
—
A
2
—
B
3
—
C
The MTL4-BYP Bypass module may be used ONLY with General Purpose bases (MTL4-
BSGP or MTL4-BSGPR). A key is built-in to the connector to prevent its insertion into an
IS base.
MTL4-SD
Loop
Disconnect
A
B
C
V out
Input/
Output
Common
MTL4-ADIO
MTL4-BSIS
1
2
3
4
10V 14mA
Input/Output
Common
26.5V 90/136mA
+
–
Load
(I/P conv)
Current
source
Output –
FIELD
SYSTEM
Analogue
Output