Pilz PNOZmulti Safety Controller Troubleshooting and Maintenance Guide

Output delay: Semiconductor output 30ms, relay output 50ms.

If multiple basic units are connected in series using Link module (PNOZ ml1p), additional data transmission time (35ms per segment) is required. For example, two basic units are cascaded through a Link module, from the input of the first unit to the semiconductor output of the second unit, with a total reaction time of 4ms (input)+35ms (transmission)+30ms (output)=69ms.

Key troubleshooting points: If the response of the security function is significantly slower than the calculated value, check if additional software filtering or logic delay is enabled. In addition, the action time of sensors and actuators themselves should also be included in the total safety time.

Expansion module installation and configuration failure

5.1 Module not recognized or SLx.dF fault

When adding or replacing an expansion module, the system reports "SLx. dF" (Slot x module type changed). This is because the hardware configuration stored in the basic unit does not match the actual detected one. Solution:

Update hardware configuration and add or remove corresponding modules in PNOZmulti Configurator.

Regenerate the project and download it to the chip card or to the base unit via USB/Ethernet.

Ensure that the physical position of the module (in left and right order) is exactly consistent with the position in the configurator. For example, the first extension module on the right should be PNOZ mi1p, etc.

5.2 Connector and Terminator errors

PNOZmulti Classic: A Terminator must be installed on the side where the extension module is not connected. The right interface of the last module on the right needs to be plugged into a PNOZmulti bus terminator; There is no terminator connected to the left side.

PNOZmulti Mini: black/yellow terminator on the left and yellow terminator on the right. Not installing a terminator can cause the system to fail to start or communication to be unstable.

Common error: Forgetting to plug back the terminator after replacing the module on site, resulting in FAULT flashing after the system is powered on. Simply reinsert the terminator and restart.

5.3 Chip card reading failure

Chip card (8kB/32kB) storage project configuration. If the download fails or prompts' CRC error ':

Check if the chip card is physically damaged or inserted incorrectly. The chip card slot has directional markings, and bending insertion can damage the contacts.

Use the Configurator to regenerate the project and save it to the chip card (via a card reader or direct online download).

Insufficient chip card capacity: Large projects (over 8kB) must use a 32kB card. You can view the project size in the Configurator.

Tips for using PNOZmulti Configurator

6.1 Project Download Method

Through Chip Card: Insert the chip card into the PC card reader and use the "Download to Chip Card" function of the Configurator. Then insert the chip card into the base unit, power on, and press and hold the reset button (or knob) for 3-8 seconds until the LED flashes.

Through USB interface: Connect the PC to the base unit using a Mini USB cable (PNOZmulti Mini provides a USB port). Select "Online" mode in the Configurator and download directly.

Through Ethernet: For basic units with ETH suffix (such as PNOZ m1p ETH), download using Modbus/TCP after configuring the IP address.

6.2 Online Diagnosis

After connecting online, you can perform the following operations:

Read error stack: Get detailed error code and text, such as "input I4 short circuit to 24V".

Monitor input/output status: dynamically display the current value of each signal.

View diagnostic words: Custom diagnostic words can indicate states such as overspeed and valve opening.

Forced output (test mode only): Used to verify wiring, but safety functions must be restored before use.

6.3 Project Protection and Backup

Password protection: Set a three-level password (read-only, read-write, hardware configuration modification) in the Configurator. Password loss requires contacting Pilz technical support.

Macro function: Common function blocks (such as emergency stop and safety door) can be saved as macros to reduce errors when reused.

Document output: Automatically generate wiring diagrams, I/O lists, and parameter tables for maintaining archives.

Maintenance and spare parts management suggestions

Regularly check the LED status: Record the LED mode during normal operation for quick identification of abnormalities.

Backup project: After each modification, backup the project file (. pzxx) and chip card contents to the server. Chip cards may age, it is recommended to replace them every two years.

Module corrosion protection: In humid or sulfur-containing environments, use a "coated version" module (such as PNOZ mi1p coated). The standard version module may experience terminal corrosion in harsh environments.

Relay output life monitoring: For applications with frequent switching (such as press machines), record the number of contact actions through the Configurator and replace them in advance when approaching the life limit.

Security verification testing: According to EN ISO 13849-1 requirements, a complete functional test must be conducted every 20 years (TM). It is recommended to conduct an annual fault injection test for all safety circuits on site.