11
INM4500-2
Mar 2009
6.1 Digital Input modules
The Digital Input (DI) module range offers solid state or relay output switches in a safe area that respond
to input switches located in a hazardous area. Single or multiple channel (2 or 4) options are available,
as well as Line Fault Detecion (LFD).
6.1.1 MTL4501-SR - Failsafe Switch/Proximity detector interface
Failsafe single channel module with line fault detection
The MTL4501-SR, enables a fail–safe switch/proximity detector located in the hazardous area to control
an isolated fail–safe electronic output. The MTL4501–SR unit provides line fault detection alarm contacts.
The MTL4501–SR is designed for use with approved fail–safe sensors.
1 2 3 4 5 6
7 8 9 10 1112
13 14
+
Fail-safe
ouput
10k
W
1k4
W
LFD
Resistors must
always be fitted
for switch inputs
+
Vs
Vs+
2035V dc
Terminal
Function
1
Input
–ve
2
Input
+ve
7
Output
+ve
8
Output
–ve
10
LFD
11
LFD
13
Supply
–ve
14
Supply
+ve
Hazardous area
Safe area
PWR
LFD
O/P
SR
MTL4501-SR
Figure 6.1
LED indicators
for MTL4501-SR
Содержание MTL4500 Series
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