Machine states and handshakes
Bottling System Automation and Control Handshakes
Specify cross-machine states and handshakes so connected equipment responds predictably to supply, blockage and fault conditions.
Decision focus
What must cross this boundary, under which condition, who owns the response, and what evidence closes the interface?
01
Direct Answer
System automation starts at the machine boundary: each connected module needs agreed meanings for ready, running, blocked, starved, faulted and stopped states, plus defined stop, reset and restart behavior.
02
Position in the System
The control layer crosses treatment transfer, bottle supply, filling, conveying, labeling, packing and handling. This page concentrates on state exchange and evidence; it does not prescribe a PLC brand, network or universal safety design.
03
Buyer Inputs
- Current machine state, alarm, I/O and communication documentation.
- Operating narrative for normal start, stop, starvation, blockage and fault recovery.
- Existing controller, panel, network and hardwired interface information.
- Clear separation of process coordination from machine and site safety functions.
- Reference product, operating condition and verification expectations.
04
Interface Map
One controlled record for the physical, process, utility, control and evidence boundary.
SystemInterfaceCard
Cross-machine operating-state handshake
- Upstream system
- Any material-supplying machine or control zone
- Downstream system
- Connected receiving machine or control zone
- Transferred material
- Machine state, demand, permissive, stop and recovery information
- Physical connection
- Approved hardwired or communications boundary documented by both suppliers
- Required condition
- Shared state meanings, fail behavior and timing basis confirmed for the connected operation
- Utility requirement
- Control power, panel and network terminal conditions from approved project documents
- Control signal
- Ready, running, blocked, starved, faulted, stopped, reset and restart
- Failure response
- Move affected modules to their defined state, preserve the safety boundary and require agreed recovery conditions before restart
- Evidence required
- Approved handshake matrix, I/O or protocol map, state-transition review and witnessed scenario results
05
Main Design Decisions
State vocabulary
Give every exchanged state one project definition, source, destination and fail behavior.
Signal ownership
Assign who detects, publishes, acknowledges and clears each interface condition.
Stop and recovery sequence
Describe how a local condition propagates and which conditions are required before each module restarts.
Verification scenarios
Test normal flow and agreed abnormal scenarios using visible state and result records.
06
Trade-offs to Resolve
Minimal signals vs. diagnostic depth
A compact interface can be easier to support; richer state and reason data can speed diagnosis. Both require unambiguous behavior.
Central coordination vs. local autonomy
Central logic can coordinate the system view; local machine logic can preserve module independence. Ownership and failure modes must remain clear.
07
Common Failure Modes
These are realistic review scenarios, not claims about a completed project.
- Two suppliers use the same signal name with different meanings or polarity.
- A fault stops one machine while upstream material continues without a defined response.
- Reset is treated as permission to restart before physical and process conditions are ready.
- Process coordination is changed without a reviewed boundary to safety functions.
08
Required Documents
- Machine state definitions and control narratives.
- Approved I/O list or protocol data map.
- Handshake and state-transition matrix.
- Alarm ownership and reset/restart rules.
- Interface scenario and witnessed-result record.
09
Questions to Ask Before Quotation
- Do both suppliers define every exchanged state in the same way?
- Who owns detection, stop propagation, acknowledgement and reset?
- What happens when a signal or communications path is lost?
- Which scenarios will be witnessed to prove the handshake and restart sequence?
Project-Specific Confirmation
Signal names, protocols, timing, fail behavior and recovery logic are supplier- and project-specific. A controls and safety review is required before implementation or testing.
11
Related System Pages
Turn the unknowns into a reviewable interface
Review My Control Handshakes
Share the available bottle, output, site, utility and supplier evidence. Open items can remain explicitly marked for confirmation.