Take turns ROUND ROBIN

How it works

A true rung picks. A false rung picks nothing, but new requests still join the line and .SEL is 0.

How it's used

Use it to share work evenly, so each waiting place gets a turn. It moves on every scan the rung is true, so pulse it with an ONS to pick once.

All three bays are calling and Pick has been on for two scans. Each scan picks the next bay in turn: Bay1, then Bay2.

In practice

Take turns: picks the next requested, available slot after the last one picked.

Configuration

• One rung per bay writes Dock.Bay1.REQ, and Dock.Bay1.RDY where the bay can take work; then XIC Dock.VAL with MOVE Dock.SEL to the destination.

Limits and status

• .SEL is the 1-based candidate; 0 means none. .ERR holds the reason code.
• Renaming a candidate renames its members everywhere.
• Renaming the tag or changing its candidates starts the selection over.
• Algorithms instructions are learning aids for deterministic selection. They are not safety-rated or certified, and they do not plan paths, avoid collisions or control motion. This is not a safety function.

Operands

Common mistakes

• Assuming Selected is zero-basedSelected is a 1-based slot, or 0 for none. Use Valid before moving it to a destination.