The 1771-OG PLC 5 TTL Output Module by Allen-Bradley is an output module with 8 sinking/sourcing outputs and is located on a slot of the 1771 I/O chassis. It is an output module with an output voltage range of 2-5.25V DC for High = True, and -0.2-0.8V DC for Low = True, and the maximum current on the output is 1mA (source) and 20mA (sink). For transmission of TTL signals, the module requires a separate 5V (+0.25V) DC power supply with a maximum ripple of 50mV peak-to-peak and 250mA current is equally required from the output of the power supply. The outputs have a maximum signal delay time of 1ms and the module dissipates 2.2W maximum heat with 7.5 BTU/hr maximum thermal dissipation when operational.
