Multi-function machines
Several interacting functions
Machines with multiple guards, stops and enabling positions where each must be evaluated and the interaction between them matters.
ConfirmConfirm the complete function list and I/O counts.
Configurable safe small controller
PNOZmulti 2
When a machine accumulates safety functions, wired relay logic stops being maintainable long before it stops being possible. PNOZmulti 2 replaces it with a configured controller that carries the safety functions and the standard control functions together, and tells the maintenance team which device actually tripped.
Configured, not programmedUp to PL e / SIL CL 3Illuminated display diagnosticsMax 4 expansion modulesFieldbus and communication modules
PL eEN ISO 13849-1
SIL CL 3IEC 62061
4Expansion modules maximum
PNOZmulti 2Base units shown; expansion follows the application
PL eDepending on application
SIL CL 3Depending on application
4 + 1 + 1Expansion, communication, fieldbus
DisplayIlluminated, with custom texts
Why it is specified
Configurable controller capabilities
The manufacturer positions the benefit as an exact match to the application through expansion modules, with diagnostics that shorten downtime.
Matched to the application
Tailor-made costs because of an exact match for the application, through the use of expansion modules.
Diagnostics on the device
An illuminated display shows error messages, supply voltage state, inputs and outputs, status, device information and individual customer texts.
Connects to common fieldbuses
Short downtimes and high plant availability through connection to all common fieldbus systems via corresponding modules.
Serviceable program memory
Exchangeable program memory and a diagnostic interface support replacement and fault-finding.
Applications
PNOZmulti 2 is used
The manufacturer lists the devices that can be connected to the base units, which is the practical measure of what the controller can take on.
Protective devices
Scanners and light curtains
Several protective devices around one cell needing coordinated evaluation, muting where applicable and a single clear reset.
ConfirmConfirm the number and type of protective devices.
Access control
Permission as a controller input
Access permission via PITreader is listed among the devices connectable to the base units, so permission becomes part of the logic.
ConfirmConfirm roles and which functions permission gates.
Technical data
Selection parameters that matter
These are the parameters that size the controller. The base unit is chosen first, then the expansion to match the application.
The manufacturer states maximum safety depending on the application up to PL e of EN ISO 13849-1 and SIL CL 3 of IEC 62061.
| Function | Configurable safe small controller for safety functions and standard control functions |
|---|---|
| Performance level | Up to PL e of EN ISO 13849-1, depending on the application |
| Integrity level | Up to SIL CL 3 of IEC 62061, depending on the application |
| Expansion | Max. 4 expansion modules connected on the left-hand side |
| Communication | Max. 1 communication module and 1 fieldbus module |
| Fieldbus | Connection to all common fieldbus systems via corresponding modules |
| Display | Illuminated display showing error messages, supply voltage state, inputs and outputs, status, device information and individual customer texts |
| Terminals | Plug-in connection terminals — choice of spring-loaded or screw terminals, available as accessories |
| Program memory | Exchangeable |
| Diagnostics | Diagnostic interface provided |
| Connectable devices | E-STOP pushbuttons, safety gate limit switches and safety gate switches, light curtains, laser scanners, two-hand pushbuttons, operating mode selector switches, pressure-sensitive safety mats, sensors, and access permission PITreader |
Configuration is a safety activity. A modified configuration must be verified and validated again, and the project version controlled, before the machine returns to production.
Models
Base unit and expansion
The order is always the same: choose the base unit, then add expansion within the stated limits.
Base unit
The starting point
frames the first question as which base unit is right for the application; expansion follows from it.
- Selection
- Application-led
- Then
- Expansion
Expansion I/O
Up to 4 modules
A maximum of four expansion modules can be connected on the left-hand side of the base unit.
- Maximum
- 4 modules
- Position
- Left-hand side
Communication
1 + 1 modules
A maximum of one communication module and one fieldbus module may be added.
- Communication
- Max 1
- Fieldbus
- Max 1
Terminals
Spring or screw
Plug-in connection terminals are available as accessories in spring-loaded or screw versions.
- Type
- Plug-in
- Options
- Spring / screw
Accessories
Terminals, memory and configuration
Three accessory decisions recur on almost every PNOZmulti 2 project.
Terminals
Plug-in connection terminals
Available as accessories in spring-loaded or screw versions, so the panel build standard decides rather than the controller.
ConfirmConfirm the preferred termination standard.
Service
Exchangeable program memory
Allows a controller to be replaced without re-loading the project from an engineering PC.
ConfirmConfirm the spares and recovery arrangement.
Engineering
PNOZmulti Configurator
The configuration tool used to define the safety functions graphically rather than by programming.
ConfirmConfirm who configures and how versions are controlled.
Before quotation
Application review
A base unit cannot be chosen without the function list and the I/O count. These inputs size the controller and its expansion.
Function inventory
- Every E-STOP, guard, light curtain, scanner and enabling device
- Which functions interact and which are independent
- Operating modes and how they change the active functions
- Target performance or integrity level per function
I/O and zones
- Safe input and safe output counts, with spare capacity
- Whether standard I/O will also be handled
- Machine zones and whether they stop independently
- Distance from the panel to the field devices
Communication
- Which fieldbus is required, and to which controller
- Whether a communication module is needed
- Diagnostics expected by the standard control system
- Whether access permission forms an input
Project and lifecycle
- Who configures, approves and may change the project
- Version control and where the archive is kept
- Commissioning evidence and validation records required
- Spares strategy and expected machine lifetime
Related technologies
PNOZmulti 2 sits in the architecture
Sensors and command devices feed the controller; the controller evaluates and drives the safe outputs. Diagnostics can be shared with the standard control system without that system becoming part of the safety function.
Guard switches and E-STOP devices
PSENopt II, PSENscan and PSENradar
Motion-monitoring modules
Safe outputs to contactors and drives
PITreader as permission input
PSS 4000 for plant-scale architectures