SDV531-S13/D4A00 S3

The Yokogawa SDV531-S13/D4A00 S3 is an 8-channel digital output module designed for the ProSafe-RS safety control system. It converts internal control logic signals into 24 V DC ON/OFF signals for field equipment. The module features module-level isolation and field wiring diagnostics. Its SDV531-S13 configuration also includes a specific output shutdown response when a field-side short circuit occurs.

Technical Specifications

Parameter	Specification
Model	SDV531-S13/D4A00 S3
Brand	Yokogawa
Product Type	Digital Output Module
System	ProSafe-RS
Number of Outputs	8 channels
Output Voltage	24 V DC
Output Format	Current source
Output Isolation	Module isolation
Output Voltage Drop	1 V maximum
External Power Supply	24 V DC
External Power Supply Tolerance	24 V DC +/- 5% for S1 style code
External Power Supply Capacity	5 A
Maximum Load Current	0.6 A per output line; 4.8 A total
Minimum Load Current	35 mA
Load Resistance Range	40 to 685 ohm
Maximum Off-State Leakage Current	1.6 mA
Maximum Output Response Time	30 ms
Withstand Voltage	2 kV AC for 1 minute between output signal lines and system, subject to connection conditions
Current Consumption	280 mA maximum at 5 V DC; 140 mA maximum at 24 V DC
Weight	Approx. 0.28 kg for pressure clamp terminal block or MIL cable configuration

Output Operation and Short-Circuit Protection

The SDV531 converts the output states generated by the ProSafe-RS safety control application into electrical signals for connected field devices. Its 8 output channels support discrete ON/OFF control, with module isolation separating the output circuits from the system side.

An important characteristic of the SDV531-S13 is its collective output shutdown response. When a short circuit occurs on the field side, the Output Shutoff Switch activates and all eight outputs on the module turn OFF. This behavior differs from the SDV531-S23 and SDV531-S33 configurations, which shut down the affected output channel.

After the short-circuit condition has been corrected, the module must be started through the SCS Status Management Window and the Output Enable Operation must be performed. The outputs then resume following their application logic values.

External Power Supply and Load Requirements

The module requires an external 24 V DC supply for its field output circuits. The standard SDV531 specification calls for a minimum 5 A supply capacity, while the S1 style code specifies a 24 V DC +/- 5% supply tolerance.

The maximum load current is 0.6 A per output line, with a combined maximum of 4.8 A across the eight output lines. Load selection must also account for the 35 mA minimum load current and the specified resistance range, including field wiring resistance.

Field Connection and Isolation

The SDV531 supports external connections through pressure clamp terminals, MIL cables, or dedicated signal cables, depending on the selected connection arrangement. The manufacturer specifies AKB331 for standard signal cable connections; AKB651 is restricted to the SDV531-L long-distance type.

The specified 2 kV AC withstand voltage applies between the output signal lines and the system for one minute under the documented test conditions. When the SDV531 is connected to an SED4D terminal board using an AKB331 dedicated signal cable, the applicable withstand voltage is 500 V AC. This distinction should be considered when checking the field wiring configuration.

Frequently Asked Questions

Q: How many digital output channels does the SDV531-S13 provide?

A: It provides eight isolated 24 V DC digital output channels. Each channel delivers an ON/OFF control signal to connected field equipment.

Q: What happens if a field-side short circuit occurs?

A: The SDV531-S13 shuts down all eight output channels when a field-side short circuit is detected. After correcting the fault, the module must be restarted through the SCS Status Management Window and the Output Enable Operation performed to restore the outputs.

Q: Can the SDV531-S13 directly drive field devices?

A: Yes. It provides 24 V DC current-source outputs for compatible field loads. The load must satisfy the specified current and resistance limits, and the external power supply must meet the module's requirements.

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