Interpreting Exclamation Mark Warnings in SIMATIC BATCH Control Center

An exclamation mark (!) appearing on a recipe procedural element (RPE) step box in SIMATIC BATCH Control Center (BCC) represents the extended status identifier RPE_EXSTATE_WARNING. This visual warning indicates an active setpoint deviation between the master recipe and the running equipment phase in the controller. Common causes include process values exceeding configured tolerance bands, parameter setpoints clamped by AS block limits, or setpoint acknowledgement mismatches. Hover the mouse over the step box to display the diagnostic tooltip detailing the specific parameter name, configured setpoint, and actual value.

SIMATIC BATCH Status Identifiers: Standard vs Extended Status

In SIMATIC BATCH Control Center (BCC), active batch control recipes are visualized graphically as sequential function charts consisting of Recipe Unit Procedures (RUPs), Recipe Operations (ROPs), and Recipe Phases (RPEs). As execution progresses, each step box changes background color and displays symbolic icons reflecting execution state:

Standard Status States: Running (green), Completed (dark green), Holding (yellow), Held (yellow/black), Aborted (red).
Extended Status Identifiers (RPE_EXSTATE_*): Overlay visual icons indicating exceptional operational conditions:

An exclamation mark (!) in the upper corner of the step box indicates RPE_EXSTATE_WARNING.

Unlike a fault that halts recipe progression (such as an interlock trip), a warning alerts the operator that the phase is executing, but one or more operational parameters have drifted outside configured quality bounds.

Root Causes of the RPE_EXSTATE_WARNING Exclamation Mark

The exclamation mark is triggered by three primary parameter evaluation mechanisms:

Tolerance Band Violation (Setpoint Deviation): In the recipe phase properties, a parameter is configured with a tolerance band (e.g. Target Temperature = 80.0°C, Tolerance = ±2.0°C). If the actual value read back from the equipment phase (PV_Out) remains outside the tolerance band (e.g. 76.5°C) while the phase is running or completing, the warning asserts.
Parameter Clamping by AS Limits: The recipe requested a setpoint that exceeds the high or low limit configured on the SFC Type in the automation station (e.g. recipe requests 1200 RPM, but SFC Type parameter SP_HiLim = 1000 RPM). The AS clamps the value to 1000 RPM, creating an acknowledged setpoint discrepancy.
Setpoint Readback Mismatch: The recipe downloaded new setpoints, but the AS equipment phase did not return an identical readback value within the handshake timeout.

Diagnostic Inspection via Tooltips, Batch Logs, and CFC Instances

To identify the exact process parameter triggering the exclamation mark:

Inspect the BCC Mouse Tooltip:
- Hover the cursor directly over the step box displaying the exclamation mark in the active control recipe view.
- A diagnostic tooltip pop-up appears, explicitly stating:

Warning: Setpoint deviation on parameter [Temperature_SP]
Target Setpoint: 80.0 °C | Actual Value: 75.2 °C | Tolerance: ±2.0 °C
Examine the Batch Control Center Message Log:
- Open the Messages pane at the bottom of the BCC window.
- Filter for the active Batch ID. The log displays an informational warning message recording the timestamp and parameter name.
Inspect the SFC Phase in CFC:
- Open the corresponding SFC Type instance in CFC and switch to Test Mode.
- Check the parameter status words and compare the target setpoint input (SP) against the actual process input (PV).

SIMATIC BATCH Procedural Element Status Icon Reference

The following table details common status identifiers and overlay symbols in SIMATIC BATCH Control Center:

Visual SymbolInternal Status IdentifierOperational MeaningSystem Impact / Next ActionExclamation Mark (!)RPE_EXSTATE_WARNINGSetpoint deviation / tolerance band violationRecipe continues; investigate parameter driftQuestion Mark (?)RPE_EXSTATE_OPERATOR_INPUTStep waiting for manual operator entryOperator must enter value or acknowledge in faceplateLock SymbolRPE_EXSTATE_BLOCKEDEquipment phase locked or allocated by another batchBatch waits for unit allocation releaseHand SymbolRPE_EXSTATE_MANUALPhase operated in manual modeAutomatic recipe progression pausedRed Cross (X)RPE_EXSTATE_ERRORExecution error / phase faultPhase halts; transition conditions blocked

[!NOTE]
Commercial Accuracy Notice: SIMATIC BATCH recipe execution and status tracking require SIMATIC BATCH Server and Recipe > System licenses (6ES7657-0AX58-0YB0). Status indicators are native diagnostic features and consume no extra licenses.

Verification

Verify that the setpoint deviation warning resolves:

Process Value Correction: Allow the process controller to bring the actual measurement within the configured tolerance band (e.g. temperature reaches 79.5°C).
Icon Disappearance: Verify that the exclamation mark disappears from the step box upon the next cyclic evaluation.
Electronic Batch Record (EBR) Verification: After batch completion, generate the Batch Report. Confirm that the setpoint deviation is documented in the audit trail logbook with exact timestamps and deviation magnitudes.

Limitations and Operational Precautions

Observe these guidelines when working with batch tolerance bands:

Recipe Tolerance Sizing: Do not configure unrealistically tight tolerance bands on slow thermal processes; doing so generates spurious warnings that desensitize operating staff.
GAMP / Validation Compliance: In pharmaceutical and validated food production, setpoint deviations documented in the electronic batch record may require formal deviation reports and quality assurance review before batch release.
Parameter Clamping Precedence: Always align Master Recipe parameter limits with the physical limits configured in the AS SFC Type.

Engineer FAQ

Does the exclamation mark in SIMATIC BATCH stop the batch from executing?

No. The exclamation mark is a warning (RPE_EXSTATE_WARNING). The recipe continues executing, but alerts operators that a parameter has deviated from target tolerance.

How do I know which parameter is causing the exclamation mark?

Hover your mouse over the step box in BATCH Control Center. The tooltip displays the specific parameter name, target setpoint, and current actual value.

Where are tolerance bands configured in SIMATIC BATCH?

In the Master Recipe editor, open the properties of the recipe phase, navigate to the parameter list, and set the low and high tolerance fields.

Will the exclamation mark be recorded in the final batch report?

Yes. SIMATIC BATCH logs all warnings, tolerance band deviations, and operator interventions in the FDA 21 CFR Part 11 compliant electronic batch record.