Rockwell Automation 1769-L23E-QB1B - Embedded DC Output Temperature Derating

48 CompactLogix Packaged Controllers
Publication 1769-IN082A-EN-P - July 2008
Embedded DC Output Temperature Derating
The area within the curves represents the safe operating range for the embedded
DC outputs under various conditions of user supplied voltages and ambient
temperatures.
(1)
Sourcing Output - Source describes the current flow between the I/O and the field device. Sourcing output circuits supply
(source) current to sinking field devices. Field devices connected to the negative side (DC Common) of the field power supply
are sinking field devices. Field devices connected to the positive side (+V) of the field supply are sourcing field devices.
Europe: DC sinking input and sourcing output circuits are the commonly used options.
(2)
Typical Loading Resistor - To limit the effects of leakage current through solid state outputs, a loading resistor can be
connected in parallel with your load. Use a 5.6K ohm, ½ watt resistor for transistor outputs, 24V DC operation.
(3)
Recommended Surge Suppression - Use a 1N4004 diode reverse-wired across the load for transistor outputs switching 24V
DC inductive loads. For additional details, refer to Industrial Automation Wiring and Grounding Guidelines, Allen-Bradley
publication
1770-4.1.
4.00
4.50
5.00
5.50
6.00
6.50
7.00
7.50
8.00
30°C (86°F) 40°C (104°F) 50°C (122°F) 60°C (140°F)
0.50
0.55
0.60
0.65
0.70
0.75
0.80
0.85
0.90
0.95
1.00
30°C (86°F) 40°C (104°F) 50°C (122°F) 60°C (140°F)
Embedded DC Outputs Maximum Amperes Per Module versus Temperature
Embedded DC Outputs Maximum Amperes Per Point versus Temperature
Ambient Temperature
Ambient Tem
p
erature
Maximum Amperes Per Point
Maximum Amperes Per Module