PILZ PNOZ m B0 configurable safety control system basic unit

Knob operation and display screen diagnosis: obtaining accurate error information

The LCD display screen and rotating press knob of PNOZ m B0 are powerful tools for on-site diagnosis, and can read error stacks without the need for a computer.

6.1 Basic Menu Navigation

Rotate knob: Move the cursor between different menu items (>symbol indicates current position).

Press the knob: Select the currently highlighted menu item.

The main interface usually displays the input/output status (dot matrix on X1~X4 terminals). Rotate the knob to enter in sequence:

ERROR: Display current unconfirmed error messages (such as "E-STOP pressed" or "FEED BACK LOOP").

PROJECT INFO: View project name, CRC, and creation date.

SHOW DEVICE INFO: View the firmware and hardware versions of the base and expansion module.

SHOW Operating INFO: Real time display of cycle time, power supply voltage, internal temperature, etc.

SHOW ERROR STACK: Enter the error stack (up to 64 historical records).

RESET PROJECT? Delete items from the base memory (restore to factory empty state).

STOP Device? Force the device to switch to STOP state (safety output turned off).

6.2 Common Error Message Analysis

According to the operation manual, the following are the most common error texts and their countermeasures:

Solution for displaying incorrect meanings

The items in the FAULTRA PROJECT chip card are damaged or incompatible. Please recompile and download them to the new or original card in the Configurator (format first)

CHIP CARD ? No chip card detected or invalid card data cleaning chip contacts; Replace the chip card; Confirm that the card has been correctly inserted into the bottom

FAULTRA TEST PULSE Test for abnormal pulse circuit (usually short circuited to high or low level) Check the wiring of T0 – T3 terminals to ensure that only the input circuit is connected and not short circuited to other power sources

PARTALLY OPERATED safety input group (such as dual channel emergency stop) only effectively checks whether the two input channels are in the same state; Search for broken wires or poor contacts in the circuit

FEED BACK LOOP feedback loop input (such as contactor auxiliary contacts) status does not match expectations. Check if the external contactor is properly engaged and if the feedback wiring is correctly connected to the IM16 and other feedback input terminals

Measure if the voltage at the+24V/0V terminal of the LOAD SUPERY semiconductor output power supply is within the range of 19.2-30V due to abnormal voltage; Check the power capacity

Supply LOW/HIGH system power supply voltage exceeds tolerance measurement A1-A2 voltage, adjust or replace power supply if necessary

Improve cabinet heat dissipation by installing fans or air conditioning when the ambient temperature exceeds the range of -10 ℃ to+70 ℃

Check if the actual hardware configuration of CONFIGURATION is inconsistent with the project configuration to see if the wrong extension module has been inserted; Is the sequence correct; Is there a lack of terminal resistance

6.3 Usage of Error Stack

After entering SHOW ERROR STACK, the display screen lists error entries in reverse chronological order (latest on top). Each one contains: serial number, error level (EC), error message (EI), error number (EN), and error parameter (PA). These codes can be provided to Pilz technical support for deeper analysis. Ordinary maintenance personnel can make preliminary judgments based on a brief description of the erroneous text.

To exit the error stack, simply rotate the knob to return to the upper menu.

Functional testing and security confirmation: non skipped steps

According to safety standards, a complete functional test must be performed after any of the following operations:

Replace chip card

I downloaded a new project via USB

Implemented 'RESET PROJECT' to delete internal projects and reload

Replaced the base unit or expansion module

Functional testing should include at least:

Enable safety input (such as releasing emergency stop button, closing safety door), and confirm that the corresponding safety output can conduct (load energized).

Trigger safety input (press emergency stop, open safety door), confirm that the safety output is cut off within the specified system response time (load power loss).

For dual channel inputs, simulate a single channel fault (such as resetting only one channel) and confirm that the safety output is not conducting.

Check that the feedback loop (such as the auxiliary contact of the contactor) is consistent with the actual action of the main contact.

If any item in the test does not match, the equipment must not be put into use and the wiring and project configuration must be rechecked.

Device Reset and Project Deletion: When to Use

8.1 Device Reset

When the device enters a safe shutdown state due to an error (such as a feedback loop error) and the external fault has been resolved, the device needs to be reset to restore normal operation. The reset method is:

Press and hold the knob for 3-8 seconds on the normal display interface. The device will restart and reload the project.

If the error still exists, the display screen will report the error again, and further investigation is needed at this time.