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1771-OJ
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Other Available Revisions for the 1771-OJ 1771-OJ//A
Common misspellings:
- l771-OJ
- 177l-OJ
- 1771-0J
- 1771OJ
The 1771-OJ is a Pulse Output Expander Module from Allen Bradley. It forms an integral part of the stepper positioning assembly which also houses the 1771-M1 Stepper Controller Module and a single 1771-WB field wiring arm. A single 1771-OJ module is capable of powering one stepper motor axis although the number of axis per I/O chassis can be expanded up to a maximum of three axis by installing a 3 Pulse Output Expander Module in the I/O chassis. The 1771-OJ occupies one slot in the 1771 I/O chassis except the leftmost slot which is assigned to the processor. The 1771-OJ module meets the Electromagnetic Compatibility standards specified in the 89/336/EEC Council directive, and it also complies with the Generic Emission and Immunity Standards. Three 1771-OJ modules can be controlled by one stepper positioning assembly. The 1771-OJ uses switches to control stops and jogs. Note that the jog switch can only be operated when the axis (corresponding) is not operating and the stop switch will instantly block output pulses from reaching the corresponding axis. The module draws a current of 800 milliamperes from the backplane at a voltage of 5 Volts DC.
A fault in the 1771-OJ module is indicated by the ACTIVE, EXPANDER COMM FAULT, and the MODULE FAULT LED indicators on the Stepper Positioning Assembly. The module accepts low true inputs which are received from the stepper translator that is supplied by the user. The 1771-OJ Pulse Output Expander Module must be supplied with an extra power source to power the switch inputs and the pulse outputs that are fed to the stepper translator and motor. The extra power source must fall under NEC Class 2 specifications. The pulse outputs for the output expander module are converted to the required current/voltage by the stepper translator and power supply. The converted information is used to precisely control the stepper motor. When repairing or installing the 1771-OJ module, disconnect power to the Stepper Positioning assembly. Use Pins 2 to 4, 8 to 10, to key the module to the backplane.
