Description

Yokogawa PFCD-S5520 S1 Field Control Station Rack 

The Yokogawa PFCD-S5520, also cataloged as the S1 Field Control Station (FCS) Rack, operates as a dedicated hardware component for direct process signal acquisition and loop execution within CENTUM VP, CENTUM CS 3000, and CENTUM CS 1000 platforms. It provides physical processing of analog and digital signals across duplexed control channels.

Hardware Specifications

Parameter	Specification
ModelBrand	Yokogawa PFCD-S5520
Origin	Japan
Weight	7.3 kg to 8.1 kg (depending on expansion modules)
Dimensions	17.8 cm x 10.2 cm x 27.9 cm
OperatingTemp	-20 degC to 60 degC
PowerConsumption	24 VDC input supply
Processor	32-bit RISC CPU with Floating-Point Unit
Memory	2 MB RAM, 2 MB Flash
Analog Inputs	Up to 64
Analog Outputs	Up to 64
Digital Inputs	Up to 128
Digital Outputs	Up to 128
Communication Protocols	Modbus, PROFIBUS, FOUNDATION Fieldbus
Hardware Architecture	Duplexed (Dual-Redundant)
Protection Rating	IP65
Ambient Humidity	5% to 95% RH (non-condensing)

DCS Process Control Features

The PFCD-S5520 incorporates channel-to-channel isolation to prevent signal interference between adjacent I/O channels. Cold-junction compensation (CJC) circuits are implemented for accurate thermocouple temperature readings. FOUNDATION Fieldbus and PROFIBUS PA connectivity allows deterministic loop execution and direct device-level communication, supporting 4-20 mA HART loop integration for hybrid analog-digital control.

Frequently Asked Questions

Q: How is hot-swapping of I/O modules handled?
A: I/O modules support controlled hot-swap under duplexed operation; only the module in the inactive channel may be replaced without interrupting the active control channel.

Q: What is the expected failover delay between primary and backup CPUs?
A: Duplexed failover occurs within a few milliseconds, limited by I/O scan synchronization and communication latency on the backplane.

Q: Can the system firmware be updated in the field?
A: Firmware updates are supported via redundant CPU channels. Updates must be applied sequentially to maintain continuous execution on the secondary channel.

Field Installation Guidelines

• Ensure DIN-rail or panel-mount alignment with secure mechanical fixation.
• Maintain proper shielded cabling and ground all analog signal lines to reduce noise.
• Route digital and analog cabling separately to avoid cross-talk.
• Confirm 24 VDC supply polarity and current capacity for all connected modules.
• Avoid exposure to condensation; ensure ambient humidity stays within non-condensing range.
• Verify backplane connection pins are fully seated before powering the unit.

Specifications

• Brand: Yokogawa

Advantages

• High reliability in industrial environments
• Supports continuous operation
• Compatible with major PLC/DCS systems