INM 5500 Rev 11
28
6.1.8 MTL5516C - Switch/Proximity detector interface
Two channel, with line-fault detection
The MTL5516C contains two changeover relays, which enable two safe-area loads to be
controlled by switches or proximity detectors located in a hazardous-area. When selected, the
line-fault detect (LFD) facility detects open or short circuit conditions in the field wiring and
also indicates this on the top of the module. Line-Fault Detect and Phase Reversal for the
channel are selected by DIL switches on the side of the module and output is provided by the
changeover relay contacts.
See page 19 for LFD and PR switch details. Channel 1 & 2 switch settings apply.
For switch sensor inputs, with LFD selected, make sure resistors (22k
Ω
and 680
Ω
) are fitted.
Note: For reliable, long-term operation the load on the output switching relays should be not less
than 50mW, e.g. 10mA at 5V DC.
Vs–
Vs+
20 to 35V dc
+
–
+
–
Ch 2
Ch 1
22kΩ
680Ω
22kΩ
680Ω
Switch-type sensors
require resistors
if LFD is selected
6
5
4
3
2
1
7
8
9
10
11
12
13
14
Hazardous area
Safe
are
a
Terminal Function
1 Input –ve (Ch 1)
2 Input +ve (Ch 1)
4 Input –ve (Ch 2)
5 Input +ve (Ch 2)
7 Normally-closed contact (Ch 2)
8 Common (Ch 2)
9 Normally-open contact (Ch 2)
10 Normally-closed contact (Ch 1)
11 Common (Ch 1)
12 Normally-open contact (Ch 1)
13 Supply –ve
14 Supply +ve
Figure 6.8:
Top label
for MTL5516C
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