S2SC70D-FA12010 Yokogawa Duplexed Safety Control Unit

The Yokogawa S2SC70D is a Duplexed Safety Control Unit for the ProSafe-RS Safety Instrumented System (SIS), designed for rack-mounted configurations supporting N-IO and FIO architectures. Its ordering options specify the processor configuration, redundant Vnet/IP communication, power supply type, operating temperature range, and explosion protection. These options must match the installed system and the required hardware configuration.

Technical Specifications

Configuration and Ordering Options

The S2SC70D ordering code determines the hardware and environmental configuration. Verify the complete model code before ordering, because processor type, power input, temperature range, and explosion protection vary by option.

Functional Overview

The duplexed architecture uses redundant control hardware and network interfaces to support safety-control operations. The dual-redundant Vnet/IP configuration provides the control-network path, while the selected power supply option determines the required input voltage. Confirm the installed processor and power supply arrangement against the system configuration before replacement.

The unit supports N-IO and FIO architectures. Check the existing cabinet design and connected I/O equipment to ensure the replacement matches the required system configuration. The available information does not establish support for every N-IO or FIO node configuration.

Environmental and Protection Options

The standard type supports an operating temperature range of -20 to 40 deg C. The wide-range type extends the specified range to -20 to 70 deg C and includes a fan unit and ISA Standard G3 option. Select the appropriate version according to the cabinet environment and the applicable hardware specification.

Explosion protection is a separate ordering option. The code 0 specifies a version without explosion protection, while code 1 specifies a version with explosion protection. The /ATDOC option identifies the Explosion Protection Manual; confirm the applicable requirements for the intended installation.

Frequently Asked Questions

Q: What power supply options are available for the Yokogawa S2SC70D?

A: The listed options are 100-120 V AC, 220-240 V AC, and 24 V DC. The required input depends on the complete ordering code and the installed system configuration.

Q: What is the difference between the -S and -E versions?

A: The -S version has a specified operating temperature range of -20 to 40 deg C. The -E version supports -20 to 70 deg C and includes a fan unit and ISA Standard G3 option.

Q: How can I identify the correct replacement unit?

A: Check the full model code, processor option, power supply voltage, explosion protection setting, and temperature range. Also verify the existing Vnet/IP and I/O architecture before selecting a replacement.