SDV144-S53/B4D00

The Yokogawa SDV144-S53/B4D00 is a 16-channel digital input module designed to receive 24 VDC discrete signals in a Yokogawa control system. It features module isolation and is configured with a dual-redundant pressure clamp terminal block without a surge absorber. Its suffix codes identify the standard module type, terminal connection arrangement, and environmental specification.

Functional Overview

The SDV144 receives discrete input signals from field devices and makes their ON/OFF states available to the control system. Its 16-channel configuration supports multiple discrete signal points through one module.

Module isolation separates the input circuitry from other module circuits. This is relevant when checking electrical signal boundaries and the isolation requirements of the control-system configuration.

Terminal Block and Ordering Configuration

The /B4D00 option specifies a dual-redundant pressure clamp terminal block for digital input connections, without a surge absorber. This option identifies the terminal-block configuration rather than changing the module's 16-channel input function.

The supplied suffix information also identifies the terminal connection arrangement and environmental specification. These details should be retained when ordering a replacement, as a matching base model alone does not establish an identical configuration.

Input Signal Characteristics

The SDV144 is designed for no-voltage contact inputs, rather than conventional voltage-output field signals. The external 24 VDC supply provides the electrical conditions required for contact-state detection. The module interprets the contact resistance as an ON or OFF state.

This distinction matters when checking field wiring. Contact resistance must remain within the specified thresholds for the module to recognize the input state correctly.

Technical Specifications

Parameter	Specification
Model	SDV144-S53/B4D00
Brand	Yokogawa
Product Type	Digital Input Module
Number of Inputs	16 channels
Input Signal	No-voltage contact
Input Current	6 mA +/- 20%
Input ON Resistance	1 kOhm maximum
Input OFF Resistance	100 kOhm minimum
External Power Supply	24 VDC
Contact Rating	24 VDC +20% / -10%
Input Response Time	40 ms maximum
Module Isolation	Yes
Withstand Voltage	2 kVAC for 1 minute, between input signals and system
Current Consumption	290 mA maximum at 5 VDC; 140 mA maximum at 24 VDC
Operating Temperature	-20 to 70 deg C (ISA Standard G3 configuration)
Terminal Block	Dual-redundant pressure clamp terminal block
Surge Absorber	Not included
Terminal Block Model	STB4D-00
Weight	0.36 kg

Model and Suffix Code Identification

The complete ordering number identifies the following configuration:

Code	Description
SDV144	16-channel digital input module, 24 VDC, module isolation
-S	Standard type
5	Pressure clamp terminal block or MIL cable connection, without explosion protection
3	ISA Standard G3, temperature range -20 to 70 deg C
/B4D00	Dual-redundant pressure clamp terminal block without surge absorber

The /B4D00 option corresponds to terminal block model STB4D-00. When using the module in a dual-redundant configuration, an additional module with the same specifications but without the terminal-block option code must be ordered.

Frequently Asked Questions

Q: Does the SDV144-S53/B4D00 accept 24 VDC digital voltage signals directly?

A: No. The SDV144 is a no-voltage contact input module. Its 24 VDC external supply supports contact-state detection; field wiring should follow the specified contact input arrangement.

Q: What is the difference between /B4D00 and /B4D10?

A: Both options specify dual-redundant pressure clamp terminal blocks. The /B4D00 version does not include a surge absorber, whereas /B4D10 includes one.

Q: Does the /B4D00 option mean that one module provides dual-redundant input processing?

A: No. It identifies the dual-redundant terminal-block configuration. A dual-redundant module arrangement requires an additional SDV144 module with matching specifications but without the option code.

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