PILZ PNOZ m B0 configurable safety control system basic unit

Two power supplies can share the same 24V power supply or use two independent power supplies separately (in this case, the two are electrically isolated). But the safety system and input circuit must be powered by the same power source (usually shared with the system power source).

The test pulse output terminals (T0-T3) can only be used to test input circuits (such as detecting short circuits in input lines). It is strictly prohibited to directly drive any load (relays, indicator lights, etc.), otherwise it will trigger the "FAULTRAY TEST PULSE" error.

Inductive loads (contactor coils, etc.) must be externally equipped with freewheeling diodes or RC absorption circuits, otherwise the high-voltage back electromotive force generated during shutdown may damage the semiconductor output.

The test pulse cable should not be parallel to the actuator cable in the same unshielded multi-core cable. Suggest separate wiring.

Typical phenomena caused by wiring errors

The safety output is always OFF: check if the output power is powered on; Check if the project is loaded correctly; Check if the feedback loop (if any) is closed correctly.

The LED "O FAULT" lights up: indicating an external output error, such as a short circuit, overload, or connection of an unacceptable capacitive load to the output terminal.

The LED "I FAULT" lights up: indicating an external input error, such as a wiring error, a test pulse circuit fault, or a partial action of one input (such as a dual channel emergency stop with only one closed).

Project Download and Chip Card Operation: Process and Troubleshooting

PNOZ m B0 does not retain the project itself. Every time it is powered on, it reads the configuration from the inserted chip card. Therefore, the condition of the chip card directly determines whether the device can operate.

4.1 Correct download steps

Confirm that the system power has been disconnected.

Insert the chip card with clean, static free fingers (pay attention to direction and do not bend).

Connect the system power supply. The LCD display screen will show the project name, CRC checksum, and creation date.

Press and hold the knob for 3-8 seconds, and the device will start copying the items from the chip card to the internal memory. Please do not turn off the power during this period.

After success, the RUN LED stays on and switches to the input/output status screen.

4.2 Download via USB

You can also use a Mini USB cable (Pilz order number 312 992 or 312 993) to connect the computer to the base. At this point, the chip card still needs to be inserted (as a storage medium), and then the download command should be executed in the PNOZmulti Configurator. This method is suitable for frequent program modifications during the debugging phase.

4.3 Common chip card related faults

Possible causes and solutions for error messages

CHIP CARD ? Check if the contact surface of the chip card is dirty or scratched when the card is not inserted, blank, or unreadable; Reinsert; Write the project using a new card

The project in the FAULTRAY PROJECT card is damaged or incompatible with the current device firmware. Use a newer version of the Configurator to regenerate the project and download it again to the chip card

After the project is loaded, the device shows no response. If the knob is not held down for a sufficient amount of time, power it back on. Hold down the knob for about 5 seconds until the loading progress is displayed

The display screen shows an error message of "CRC". If the checksum does not match, regenerate and download the item to ensure that the computer item matches the card

Important: The power must be turned off before inserting or removing the chip card. Do not bend the card body, otherwise it may damage the contact spring. When not in use for a long time, it is recommended to store the chip card separately in an anti-static bag.

LED indicator light diagnosis: quickly locate fault levels

The front of PNOZ m B0 has multiple dual color/monochrome LEDs, which can be combined to quickly determine the fault range. The following table summarizes the key states:

The meaning and action of LED (PWR, RUN, DIAG, FAULT, I FAULT, O FAULT)

RUN is off, FAULT is flashing. The user program has been deleted - please download the project again

FAULT stays on, DIAG flashes, external errors cause safety status: such as unplugged chip card, feedback loop disconnection, abnormal test pulse

I FAULT constantly on input external error (does not affect safety forced shutdown): If the dual channel input part is activated, the wiring needs to be checked

O FAULT constantly on output external error (does not affect safety shutdown): such as safety output short circuit or feedback input fault

FAULT flashing and abnormal I/O status display internal hardware error - replace base unit

PWR is normal, RUN is turned off and the device is in STOP state - it may be that the project is not loaded or there is a serious error

During the debugging phase, the most common occurrence is when I and O FAULT light up but the device does not output. At this point, you should use the knob to enter the diagnostic menu and view detailed error text (see below).