PILZ 312070 PSSu H PLC1 FS SN SD Safety Module

The PILZ 312070 PSSu H PLC1 FS SN SD is a head module (CPU) within the PSSuniversal safety system, designed for decentralized safety automation. It processes safety-related user programs, monitors emergency stops, light curtains, two-hand controls, and safety gate switches. The module meets SIL 3 according to IEC 61508 and PL e according to ISO 13849-1, suitable for high-risk machinery.

Technical Specifications

• Safety Integrity Level: SIL 3 (IEC 61508), PL e (ISO 13849-1)

• Processor: Dual-channel, 32-bit architecture with self-test

• Program Memory: 512 kB for safety application

• Communication Interfaces: PSSuniversal backplane (system bus) and 1x Ethernet (service)

• Number of Safe I/O Points: Expandable up to 128 via PSSu I/O modules

• Response Time: Typically 20 ms for safety reaction

Functional Safety Features

The module runs two independent processing channels that cross-compare results every cycle. Any mismatch triggers a safe state (outputs off). The integrated watchdog monitors execution time and voltage rails. Diagnostic coverage is >99% for internal faults. The module also supports configurable test pulse outputs for monitoring external wiring to sensors.

Programming and Configuration

Using Pilz PAS4000 software (FBD or LD according to IEC 61131-3), engineers can create safety logic. The module stores the user program in non-volatile memory with checksum protection. Online debugging allows viewing of safe variables without compromising integrity. Firmware updates are performed via the Ethernet port using memory card.

Physical and Environmental

The module measures 49 mm width x 100 mm height x 72 mm depth. It snaps onto a DIN rail with a PSSuniversal backplane base. Operating temperature: -25°C to +60°C; storage: -40°C to +85°C; humidity: 95% non-condensing. Power supply: 24 VDC (19.2 – 30 V), 120 mA typical. Protection class IP20.

Application Examples

Common deployments in press brakes, packaging machines, robotic cells, and AGV safety controllers. The module can act as a standalone safety PLC or as a remote station for a higher-level master (PROFIsafe or SafetyBUS p via adapter). It includes status LEDs: RUN, SAFE STOP, DIAG, and Ethernet link.