Eaton MTL4516 - 6.5 Analogue Output Modules

INM 4500/4600 Rev 12
48
DRAFT - 22 March 2018 DRAFT - 22 March 2018
6.5 Analogue Output modules
The analogue output (AO) modules accept 4/20mA floating signals from safe-area
controllers to drive current/pressure converters (or any other load up to 800 ) in a
hazardous area.
6.5.1 MTL4546/MTL4546C/MTL4546S/MTL4546Y/MTL4545Y - Isolating Driver
Single channel, 4/20mA, HART® for valve positioners with line-fault detection
The MTL4546 accepts a 4/20mA floating signal from a safe-area controller to drive
a current/pressure converter (or any other load up to 800 ) in a hazardous area. For
HART valve positioners, the module also permits bi-directional transmission of digital
communication signals so that the device can be interrogated either from the operator
station or by a hand-held communicator. Process controllers with a readback facility
can detect open or short circuits in the field wiring: if these occur, the current taken into
the terminals drops to a preset level. The MTL4546C and MTL4546Y are identical to the
MTL4546 except that they provide open circuit detection only (no short-circuit detection).
The MTL4546S has a reduced maximum open-circuit voltage which permits the usage of
longer field lines compared to the MTL4546.
Input Characteristics
Field wiring state MTL4546 MTL4546C MTL4545Y/
MTL4546Y
Normal < 6.0V < 6.0V < 6.0V
Open-circuit < 0.9mA < 0.9mA < 0.5mA
Short-circuit < 0.9mA N.A. N.A.
Terminal Function Term MTL4545Y only
1 Output –ve 1 Output –ve
2 Output +ve 2 Output +ve
11 Input –ve 8 Input –ve
12 Input +ve 9 Input +ve
13 Supply –ve 12 ID resistor
14 Supply +ve 13 Supply –ve
14 Supply +ve
Hazardous area Safe area
–
+
4/20mA
P
I
4/20mA
+
–
Vs–
Vs+
20 to 35V dc
6
5
4
3
2
1
I
I
9
8
7
12
11
10
13
14






S
Figure 6.31:
Top labels for
MTL4546,
MTL4546C,
MTL4546Y &
MTL4546S