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If you have a SLC 500 processor: Category # L551-1747, SER: C proc Rev: 5
OS: 1747-OS501, SER C, FRN 9th
when switching, LED status: FLT all days of solid red, RUN forever. Other (BATT, strength, ENET, RS232) stops blinking or off.

try, you can communicate with the processor 232 can not connect.

I appreciate all your input. If you need more information, ask here.

Try removing the battery, and either for about 1-2 minutes, or use a jumper, where he was waiting in the short remaining battery voltage involved.

If any of REpower CPU and the LED patterns are still there, and you can not connect, then the CPU is probably pooched

Understanding in this case
Processors were back to our office on a separate bench to put the same theoretical examination. While they are at various booths on plants that were installed in delayed, but we feel through rack / power supply from different backgrounds was a good idea. Our test has the same rack as the shelves in this area.

Yes, these devices have been installed and is running every day for about four years. The batteries were the false ads, so we went to replace them.

Yes, we were looking at remanufactured processors. I had to explain how it causes confusion. (more…)

Tags: Allen Bradley PLC, Allen Bradley SLC, PLC Fault, PLC Product, SLC 5/05Allen Bradley PLC, Allen Bradley SLC, PLC Fault, PLC Product, SLC 5/05

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A state diagram can be converted to equations by writing an equation for each state and each transition.
A sample set of equations seen in See State Transition equations for the traffic light example, see a traffic light state diagram.
Each state and the transition must be assigned a unique variable name. (Note: It is a good idea to note these on the diagram)

These are then used to write equations for the diagram.
The transition equations are written by looking at each state, and then determining which transitions will end this state.
For example, if ST1 is true, and crosswalk button S1 is pushed, and S2 is not, then transition T1 will be true. The state equations corresponding to the state equations in the previous State Equation method, except that they now only refer to transitions. Recall, the basic form of these equations is that the State will be where it is already on, or it is turned on by a transition. The State will be off if the exiting transition occurs. In this example the first scan had his own transition, but it could also have been put into the equation for T4. (more…)

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