Overview
Configured for temporary CPU backup power support during main power interruption in Yokogawa control systems, the Yokogawa S9971DB-0 (S9971DB CPU Backup Battery Module) provides direct electrical backup capability for CPU data retention and controlled system operation. The module automatically transfers to backup power when the primary supply is interrupted. However, the exact battery chemistry, retention time, charging characteristics, and system compatibility must be confirmed against the applicable Yokogawa system documentation.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | S9971DB-0 |
| Base Model | S9971DB |
| Brand | Yokogawa |
| Manufacturer | Yokogawa Electric Corporation |
| Product Type | CPU Backup Battery Modules |
| Primary Function | Temporary backup power support for CPU operation and data retention |
| Compatible Systems | Yokogawa industrial control systems; exact platform compatibility requires confirmation |
| Operation Mode | Automatic transfer to backup power during primary power interruption |
| Charging System | Internal charging function reported; exact charging characteristics require confirmation |
| Battery Technology | Rechargeable battery configuration; exact chemistry requires confirmation |
| Origin | Japan |
| Weight | Approx. 0.3 kg; source value requires confirmation |
| Dimensions | Approx. 160 mm x 100 mm x 25 mm; source value requires confirmation |
| Mounting | System-specific CPU or control hardware installation |
| Application | CPU backup and retained data support during power interruption |
Process Control System Integration
Within Yokogawa process control architectures, the S9971DB-0 supports the continuity requirements of CPU hardware during temporary power disturbances. The module operates as a local backup power component rather than a field signal interface.
Therefore, it does not directly process a 4-20 mA HART loop signal or provide FOUNDATION Fieldbus and Profibus PA communication. Instead, correct installation depends on the specified CPU hardware interface, battery connection arrangement, and system power architecture.
Before replacement or installation, isolate the applicable system power source according to site procedures. In addition, verify battery polarity, connector orientation, and the compatibility of the S9971DB-0 with the installed Yokogawa CPU assembly. Do not connect the module to an external charging source unless Yokogawa documentation specifically permits that configuration.
Frequently Asked Questions
Q: Does the S9971DB-0 provide direct power to field I/O modules?
A: No such function is specified in the provided data. The module is described as a CPU backup battery component for temporary CPU power support and data retention.
Q: Can the battery chemistry be identified from the S9971DB-0 model number alone?
A: No. The provided information does not confirm the exact battery chemistry. Installation or replacement should use the battery specification approved for the applicable Yokogawa hardware.
Q: Can the S9971DB-0 be replaced while the control system is energized?
A: Hot replacement capability is not specified in the provided technical data. Follow the applicable Yokogawa maintenance procedure and site isolation requirements before replacement.
Field Installation Guidelines
- Confirm that the installed CPU hardware accepts the S9971DB-0 before installation.
- Isolate system power according to the approved maintenance procedure when hot replacement is not documented.
- Check connector orientation and battery polarity before applying electrical connection.
- Keep battery wiring separated from high-current switching conductors and power cables.
- Inspect the connector contacts for contamination, corrosion, or mechanical damage.
- Do not modify the battery enclosure or connect an external charging circuit without manufacturer approval.
- After installation, restore system power and verify CPU startup, retained data status, and diagnostic indications.
- Record the replacement date according to the site’s preventive maintenance procedure.
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