9/24/2020 3:41 PM | |
Joined: 7/7/2010 Last visit: 4/24/2024 Posts: 14620 Rating: (2348)
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There are networks (traditional rungs from other PLC manufacturer's terminology). Then there are rungs within networks where parallel branches can be configured. Since LADDER logic emulates physical control wiring ladders, a network is the logic components required to drive a single output. At least if you think like this, it makes it easier to group things together logically. Use nearly as many rungs as you like to accomplish this (there are limits of course, just like most anything). If you were to wire up a conveyor motor's contactor, it might need a high limit, low limit, start / stop buttons, auto / manual mode selector switch, inhibit / interlock from downstream process, and also drive an interlock to the upstream process (that may require the conveyor to be running before it can operate and unload items). A network could be all the logic required to turn the conveyor on, with an extra rungs for latching, drive the upstream interlock - which might depend on the conveyor state as well as the high/low limits.
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