150-F361NBR A-B Power Board
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IN STOCK150-F361NBR A-B Power Board
Standard polling mode is strongly recommended for larger systems that require time critical communication between the master and all the slave stations, or for any system where slave station-initiated messages are going to be used (this includes slave programming over the network, since this uses the same mechanism that slave-to-slave messaging uses). The Active Node Table automatically keeps track of which slaves are (and are not) communicating. Standard polling mode should NOT be used in cases where the user needs to be able to limit when and how often the master station communicates with each slave station.
Standard polling mode causes the master station to continuously send one or more 4-byte poll packets to each slave station address configured by the user in the poll list(s) in round robin fashion. As soon as the end of the polling list is reached, the master station immediately goes back and starts polling slave stations from the top of the polling list over again. This is independent and asynchronous to any MSG instructions that might be triggered in the master station ladder logic. In fact, this polling continues even while the master station is in program mode. Refer to chapter 3 of the DF1 Protocol and Command Set Reference Manual, publication 1770-RM516, for additional information.
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