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When the load current is less than, or equal to 100 mA, the output is turned OFF and the fault flag is set. To prevent the fault flag from being set, a resistor should be placed between the output point and the group return. For example, @ 20 Vdc the minimum load is 200 Ω, @ 24Vdc the minimum load is 240 Ω, and @ 28 Vdc the minimum load is 280 Ω. When the output is already on and the load exceeds the open load trip level for one to one and a half ms, the output is turned OFF, and the fault flag is set.When the load current exceeds the over current trip level following the switching of a point from OFF to ON, the output is turned OFF, and the fault flag is set. When the output is already on and the current exceeds the over current trip level for one to one and a half ms, the output is turned OFF, and the fault flag is set.
the following about unused outputs in a B882 z Unused outputs should not be turned on since their field points are not wired. z Turning them on will cause an open load fault and the active light will blink. z The minimum load required is 100 mA.
User connections are made to a standard screw terminal strip. The rigid wiring system permits module insertion or removal without disturbing the wiring. Setting the DIP switch allows selection of bi-directional fault reporting or uni-directional nonfault reporting functionality prior to installation. The following illustration shows the B882–032 terminal numbering and output connections
User connections are made to a standard screw terminal strip.The rigid wiring system permits module insertion or removal without disturbing the wiring. Terminal Numbering and Output Connections The following figure shows terminal numbering and output connections for the the B818 module.The following figure shows the keying for the the B818 module
The four-position dip switch is located on the rear of the module. This switch controls the functionality of the module (bi-directional or uni-directional). Set switch SW3 for either (B882) bi-directional fault reporting, or (B818) unidirectional non-fault reporting. Refer to the following illustration for switch settings. Also refer to the label located on the left side of the module itself. The following illustration shows the B882–032 dip switch settings
Selecting the bi-directional module functionality(B882) allows 32 discrete outputs and 32 returned fault flags. Selecting the uni-directional module functionality (B818) allows 32 discrete outputs.
Look at registers 30001 and 30002 in binary format, all bits should be set to a one indicating a returned fault. The fault is present as a result of the open-load condition of the outputs. The module is correctly monitoring its output points and is being read properly by the controller.Active blinking = One or more outputs have sensed a load fault. Active on steady = Points have the minimum load requirements.