PILZ PNOZmulti Safety Controller Maintenance Guide

TIP: For Mini models with a display screen, rotating the knob to enter the "ERROR" menu allows you to directly see error text, such as "FEED BACK LOOP" or "PARTALLY OPERATED", without the need to remember the LED combination.

Error Stack Reading: Deep Diagnosis

When the system experiences intermittent faults or multiple alarms, the error stack is a valuable tracing tool. The basic unit can store up to 64 status and error messages internally.

5.1 Viewing Error Stack on Mini Display Screen

Rotate the knob and select the menu SHOW ERROR STACK.

Press the knob to enter. Display the latest error entry (with the highest number 1).

Each one contains: Error Class (EC), Error Information (EI), Error Number (EN), and Error Parameters (PA).

Rotate the knob to scroll through historical entries.

5.2 Common Error Messages and Countermeasures

Solution to Error Text Reason

FEED BACK LOOP feedback loop external error: contactor auxiliary contact status does not match expectations. Check if the external contactor is engaged; Whether the feedback signal is connected to the correct feedback input terminal (such as I14); Check if the feedback loop is configured but not actually wired

PARTALLY OPERATED Dual channel Safety Input: Only one channel is high level. Check if there are any broken wires or poor contacts in the wiring of the two channels; Check if the sensor itself is damaged

FAULTRA TEST PULSE Test: If the pulse output terminal is short circuited to ground or connected to a load, remove all external wiring from the T0-T3 terminals and only retain the connection to the input device; Measure the resistance to ground with a multimeter

Measure the voltage of the semiconductor output power supply (24V/0V terminal) when the voltage is lower than 19.2V; Check if the power capacity is sufficient

Measure A1/A2 voltage when the power supply voltage of the SUPERY LOW system is below 19.2V; Consider replacing the power supply with a larger capacity

If the power supply voltage of the SUPERY HIGH system is higher than 30V and the power supply voltage is reduced, it may be a fault in the stabilized power supply

The hardware configuration of CONFIGURATION is inconsistent with the project, such as inserting unconfigured extension modules or comparing the actual module type with the hardware list in PNOZmulti Configurator due to sequence errors; Reorder and download projects

Improve cabinet heat dissipation by adding fans or air conditioning when the working environment temperature exceeds 60 ℃

5.3 Reading Error Stack through Configurator

Connect the PC to the base unit via USB or Ethernet (communication module required), and click "Online" ->"Read Error Stack" in the Configurator to export a complete record containing timestamps for remote technical support analysis.

System response time calculation: verifying safety performance

When the safety function (such as emergency stop) is triggered, does the output cut-off time meet the risk analysis requirements? This requires calculating the maximum reaction time.

6.1 Calculation Formula

text

t_ReactionMax = t_InputDelayMax + t_SwitchOffDelayMax

among which

T_InputDelayMax: The maximum delay of the input module (including filtering and debounce). For the input that comes with the basic unit, the typical value is 4 ms.

T_SwitchOffDelayMax: The maximum turn off delay of the output module (including internal processing time). The semiconductor output is 30 ms, and the relay output is 50 ms.

Example: If using basic unit input+PNOZ mo1p semiconductor output, the maximum response time is 4 ms+30 ms=34 ms.

6.2 Cascade Multiple Basic Units (via Link Modules)

When two or more PNOZ multi systems are cascaded through PNOZ ml1p (Classic) or integrated Safe Link (Mini mm0.2p), the number of links needs to be multiplied in the formula:

text

t_ReactionMax = t_InputDelayMax + (n × t_BUS) + t_SwitchOffDelayMax

Among them, t_BUS=35 ms (the transmission time of data between link modules). N is the number of cascaded connection segments.

For example, three basic units are connected in series, from the input of the first unit to the output of the third unit, n = 2， The reaction time is 4 ms+(2 × 35 ms)+30 ms=104 ms.

Note: Input delay and output shutdown delay are only calculated once and will not be repeatedly accumulated.

6.3 Other factors affecting reaction time

A fixed delay time (such as a timer) configured for a certain functional block in the Configurator.

The response time of external sensors (such as light curtains).

The mechanical action time of actuators (such as contactors).

These external times must be added to the total response time of the safety circuit by the engineer themselves.

Selection and spare parts recommendations

To avoid prolonged downtime due to production stoppage or long lead times, it is recommended to establish a spare parts strategy for critical equipment.

7.1 Basic Unit Spare Parts

Model, Order Number, Applicable System

PNOZ m0p 773110 Classic entry-level

PNOZ m1p 773100 Classic Standard Extended Type

PNOZ m1p ETH 773103 Classic with Ethernet interface

PNOZ mm0p 772000 Mini non expandable type

PNOZ mm0.1p 772001 Mini Expandable Type