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22
INM MTL SUM5 Rev 1
MTL4-BSGPR
Module base general-purpose relay
MTL4-BSISR
Module base IS relay
The user can choose from normally open (NO) or normally closed (NC) contacts to suit
the application. Inductive loads should be provided with suitable suppression circuitry to
avoid damaging voltage spikes.
Consult the product datasheet for applicable drive voltages and relay contact ratings.
6.4 Analogue input (AI)
The MTL4-ADIO provides a fully floating dc supply for conventional 2 or 3-wire 4/20mA
transmitters. In addition, HART transmitters are supported, offering bi-directional
communications signals superimposed on the 4/20mA loop current. A link (LK1) can be
fitted to the module base to increase the transmitter voltage for non-HART applications,
when necessary. Consult the datasheet for full details.
MTL4-LNKIS-50
IS power jumper link (Pk50)
WARNING!
Fitting link LK1 will change the Safety Description of the product. Refer to
the certificate for details.
Figure 6.4
- Analogue input options
There is provision for a selection of sink or source current outputs on the system side, as
illustrated above, as well as a voltage option.
LK1
V
+
–
Voltage
source
Current
source
4 wire
Tx
2 wire
Tx
3 wire
MTL4-SD
Loop
Disconnect
A
B
C
V out
Input/
Output
Common
MTL4-ADIO
MTL4-BSxx
1
2
3
4
10V 14mA
Input/Output
Common
26.5V 90/136mA
Current
source
Input +
Input –
Load
Current
sink
Tx+
Input +
Load
0V
V
Voltage
Input +
Input –
FIELD
SYSTEM
Analogue
Input
Analogue
Output