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Reference Manual
00809-0100-4696, Rev AA
September 2004
Rosemount 848L
A-2
Outputs
4 Discrete Outputs
9-32 VDC loads
Maximum load inductance 300 mH
Current Ratings: 1.0 A maximum for single channel on, 4.0 A maximum per
device.
Output devices must be selected as follows:
1. Designed to use the same DC voltage as supplied to the 848L I/O
power terminals.
2. The DC resistance must be large enough that they consume no more
than 1 amp of current steady state. The internal impedance of the
848L is negligible, therefore the Output device’s current is simply
calculated as: I/O power / DC resistance.
3. The inductance of the output device must be less than 300 mH.
The maximum total output current for the device will depend on the ambient
temperature as shown in Figure A-1.
Figure A-1. Temperature vs.
Output Current
Thermal Shutdown Protection prevents damage to the device if temperature
specifications are exceeded.
Ambient Temperature (DegC)
45
Total Output Current (Amps)
2.0
1.5
1.0
0
3.5
3
2.5
4
0.5
50
55
60
65
70
75