Scenario: Host Command Execution¶

1. Overview¶

This scenario describes the complete flow of host remote command execution, from command send to completion notification.

2. Preconditions¶

Condition	Required State
Communication	COMMUNICATING
Control State	ONLINE REMOTE
Process State	Varies by command

3. Command Flow Overview¶

sequenceDiagram participant Host participant Equipment rect rgb(240, 248, 255) Note over Host,Equipment: Command Request Host->>Equipment: S2F41 W (RCMD, Parameters) Equipment-->>Host: S2F42 (HCACK, CPACK) end rect rgb(240, 255, 240) Note over Host,Equipment: Command Execution Note over Equipment: Execute command... end rect rgb(255, 248, 240) Note over Host,Equipment: Completion Notification Equipment->>Host: S6F11 W (CommandComplete event) Host-->>Equipment: S6F12 (ACKC6=0) end

4. START Command Example¶

4.1 Sequence Diagram¶

sequenceDiagram participant Host participant Equipment Note over Equipment: State: IDLE Host->>Equipment: S2F41 W Note right of Host: RCMD="START" RecipeID="RECIPE001" LotID="LOT001" Note over Equipment: Validate command Note over Equipment: Check recipe exists Note over Equipment: Verify parameters Equipment-->>Host: S2F42 Note left of Equipment: HCACK=0 (Accepted) Note over Equipment: State: SETTING UP Equipment->>Host: S6F11 W (ProcessStateChange) Host-->>Equipment: S6F12 Note over Equipment: Load recipe Note over Equipment: Initialize process Note over Equipment: State: READY Equipment->>Host: S6F11 W (ProcessStateChange) Host-->>Equipment: S6F12 Note over Equipment: State: EXECUTING Equipment->>Host: S6F11 W (ProcessStarted) Note right of Equipment: Report: RecipeID, LotID, StartTime Host-->>Equipment: S6F12

4.2 S2F41 Message Structure¶

S2F41 W
<L[2]
  <RCMD "START">
  <L[2]
    <L[2]
      <CPNAME "RecipeID">
      <CPVAL "RECIPE001">
    >
    <L[2]
      <CPNAME "LotID">
      <CPVAL "LOT001">
    >
  >
>

4.3 S2F42 Success Response¶

S2F42
<L[2]
  <HCACK 0>           // Command accepted
  <L[0]>              // No parameter errors
>

5. Command Rejection Scenarios¶

5.1 Wrong Control State¶

sequenceDiagram participant Host participant Equipment Note over Equipment: State: ONLINE LOCAL (not REMOTE) Host->>Equipment: S2F41 W (RCMD="START") Equipment-->>Host: S2F42 (HCACK=2) Note left of Equipment: Cannot perform now (wrong control state)

Response:

S2F42
<L[2]
  <HCACK 2>           // Cannot perform now
  <L[0]>
>

5.2 Wrong Process State¶

sequenceDiagram participant Host participant Equipment Note over Equipment: State: EXECUTING (cannot START) Host->>Equipment: S2F41 W (RCMD="START") Equipment-->>Host: S2F42 (HCACK=2) Note left of Equipment: Cannot perform now (wrong process state)

5.3 Invalid Command¶

sequenceDiagram participant Host participant Equipment Host->>Equipment: S2F41 W (RCMD="INVALID_CMD") Equipment-->>Host: S2F42 (HCACK=1) Note left of Equipment: Invalid command

5.4 Parameter Error¶

sequenceDiagram participant Host participant Equipment Host->>Equipment: S2F41 W Note right of Host: RCMD="START" RecipeID="NONEXISTENT" Equipment-->>Host: S2F42 Note left of Equipment: HCACK=3 (Parameter error) CPACK=2 (Illegal value)

Response:

S2F42
<L[2]
  <HCACK 3>           // Parameter error
  <L[1]
    <L[2]
      <CPNAME "RecipeID">
      <CPACK 2>       // Illegal value
    >
  >
>

6. PAUSE and RESUME Commands¶

6.1 Pause Sequence¶

sequenceDiagram participant Host participant Equipment Note over Equipment: State: EXECUTING Host->>Equipment: S2F41 W (RCMD="PAUSE") Equipment-->>Host: S2F42 (HCACK=0) Note over Equipment: Complete current step Note over Equipment: State: PAUSING Note over Equipment: State: PAUSED Equipment->>Host: S6F11 W (ProcessPaused) Note right of Equipment: Report: PauseReason, CurrentStep Host-->>Equipment: S6F12

6.2 Resume Sequence¶

sequenceDiagram participant Host participant Equipment Note over Equipment: State: PAUSED Host->>Equipment: S2F41 W (RCMD="RESUME") Equipment-->>Host: S2F42 (HCACK=0) Note over Equipment: State: EXECUTING Equipment->>Host: S6F11 W (ProcessResumed) Host-->>Equipment: S6F12

7. ABORT Command¶

7.1 Abort Sequence¶

sequenceDiagram participant Host participant Equipment Note over Equipment: State: EXECUTING Host->>Equipment: S2F41 W (RCMD="ABORT") Equipment-->>Host: S2F42 (HCACK=0) Note over Equipment: State: ABORTING Note over Equipment: Safe shutdown sequence Note over Equipment: State: IDLE Equipment->>Host: S6F11 W (ProcessAborted) Note right of Equipment: Report: AbortReason, AbortTime Host-->>Equipment: S6F12

8. Command Timeout Handling¶

8.1 No Response (T3 Timeout)¶

sequenceDiagram participant Host participant Equipment Host->>Equipment: S2F41 W (RCMD="START") Note over Equipment: Equipment busy/crashed Note over Host: T3 timeout (45 sec) Note over Host: Raise timeout error

8.2 Command Execution Timeout¶

Host should monitor for completion event within expected time:

Command	Expected Completion	Timeout Action
START	ProcessStarted event	Query process state
PAUSE	ProcessPaused event	Retry or escalate
ABORT	ProcessAborted event	Check equipment status

9. HCACK Response Codes Summary¶

HCACK	Meaning	Typical Cause
0	Accepted	Command will execute
1	Invalid command	RCMD not recognized
2	Cannot perform now	Wrong state
3	Parameter error	Invalid CPNAME or CPVAL
4	Async completion	Command queued
5	Rejected, already in state	e.g., PAUSE when paused
6	No such object	Object reference invalid

Event	CEID	Trigger
RemoteCommandReceived	6001	Any S2F41 received
RemoteCommandCompleted	6002	Command execution success
RemoteCommandFailed	6003	Command execution failed
ProcessStarted	101	START command success
ProcessPaused	104	PAUSE command success
ProcessResumed	105	RESUME command success
ProcessAborted	103	ABORT command success