Rockwell Automation 1762-OB8 Solid State 24V dc Source Output Module - Manual (Page 12)

12 MicroLogix 1762-OB8 Solid-State 24V DC Source Output Module
Publication 1762-IN008B-EN-P - July 2013
Sourcing Output - Source describes the current flow between the I/O module 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 module circuits are the commonly used options.
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 Ω, 1/4W resistor for
transistor outputs, 24V DC operation.
Recommended Surge Suppression - Use a 1N4004 diode reverse-wired across the load for
transistor outputs switching 24V DC inductive loads. For additional information, refer to
Industrial Automation Wiring and Grounding Guidelines, Allen-Bradley publication 1770-4.1.
Output Specifications
Specification 1762-OB8
Voltage Category 24V DC
Operating Voltage Range 20.4…26.4V DC
Number of Outputs 8
Bus Current Draw (max.) 115 mA @ 5V DC (0.575W)
Heat Dissipation (max.) 1.61 Total Watts
Signal Delay (max.) – resistive load On Delay: 0.1 ms
Off Delay: 1.0ms
Off-State Leakage (max.) 1.0 mA
On-State Current (min.) 1.0 mA
On-State Volage Drop (max.) 1.0V DC
Continuous Current per Point (max.) 0.5A @ 55°C; 1.0A @ 30°C
Continuous Current per Module (max.) 4.0 A @ 55°C; 8.0 A @ 30°C
Surge Current (maximum) 2.0 A (Repeatability is once every 2 seconds for a duration of 10 msec.
Power Supply Distance Rating 6 (The module may not be more than 6 modules away from the power
supply.)
Isolated Groups Group 1: Outputs 0…7
Output Group to Backplane Isolation Verified by one of the following dielectric tests: 1200V AC for 1 sec. or
1697V DC for 1 sec.
75V DC working voltage (IEC Class 2 reinforced insulation)
Vendor ID Code 1
Product Type Code 7
Product Code 101