The Allen-Bradley 1756-OB16DK module is a digital output module for Allen-Bradley ControlLogix 5580 programmable controllers. The 1756-OB16DK module includes 16 diagnostic outputs with 8 points per group. The pilot duty current is 2 Amps at 30 degrees Celsius and 1 Amp at 60 degrees Celsius. The voltage category of the module is 24 Volts DC source voltage. The operating voltage range is from 19.2 to 30 Volts DC. The nominal and maximum output delay times for the off to on process are 60 microseconds and 1 millisecond, respectively. The nominal and maximum output delay times for the on to off process are 630 microseconds and 5 milliseconds, respectively. The current draw at 5.1 Volts DC is 250 milliamps and the current draw at 24 Volts DC is 140 milliamps. The total backplane power draw for the module is 4.4 Watts. The maximum power dissipation for the module is 3.3 Watts at 60 degrees Celsius. The thermal dissipation for the 1756-OB16DK module is 11.25 BTU per hour.
The 1756-OB16DK module requires one slot in a chassis for installation. The enclosure of the module is open and it complies with the T4A North American temperature code. The maximum temperature of the air surrounding the module should not be allowed to exceed 60 degrees Celsius. During storage, the 1756-OB16DK module should be kept in an environment where the temperature is maintained between –40 and 85 degrees Celsius. The 1756-OB16DK module is conformally coated for protection against corrosive elements in hazardous locations. The vibration rating for the module is 2 G at 10 to 500 Hertz. The operating shock rating is 30 G.
FAQ for 1756-OB16DK
The 1756-OB16DK ControlLogix Conformal-Coated Diagnostic Outputs Module by Allen-Bradley is a chassis-based output module with 16 diagnostic 24V DC outputs arranged in groups of 8. It has 19.2-30V DC operational voltage and it has a maximum signal delay time of 1ms and 5ms for OFF-to-ON and ON-to-OFF respectively. The 1756-OB16DK has a draw current of 250mA at 5.1V DC and 140mA at 24V DC and a total backplane power rating of 4.64W. The module has a maximum voltage loss of 1.1V DC at 2A in the ON state and the module has a leakage current of 1mA per output point. Each output point can have a current surge of 4A for 10ms per recurring every 1s, and the minimum current load each output can take is 3mA. The normal current on each point is 2A at 30 °C and the aggregate current on the module is 8A.
The 1756-OB16DK has a voltage isolation of 250V between outputs-to-backplane and output group-to-group with basic insulation tested for 2 seconds at 1350V AC and it offers electronic fusing on each point. The module occupies a single slot width and field-side wiring is possible through the user-defined mechanically keyed Removable Terminal Block (1756-TBS6H or 1756-TBCH). The 1756-OB16DK has T4 and T4A (IEC and North America) designated temperature codes and comes in an open-style enclosure. It has an operational temperature range between 0 and 60 °C at a relative humidity level of 5-95% without condensation. The 1756-OB16DK is tested to withstand an operational shock of 30G and a vibration of 2G at 10-500Hz.
Revisions for 1756-OB16DK
Please refer to the manual for more information about the 1756-OB16DK such as the wiring diagrams, data sheets,
firmware information and migration or obsolescence details.
|Revision Part #
||Also Known as
||1756-OB16DK/A, Series A, Rev A