Description

Yokogawa SRM53D-000/BR4 Analog Terminal Board

The Yokogawa SRM53D-000/BR4, also cataloged as the SRM53D-000 Analog Terminal Board, operates as a dedicated hardware component for digital contact output transmission within the ProSafe-RS safety system.

Hardware Specifications

Parameter	Specification
ModelBrand	Yokogawa SRM53D-000/BR4
Origin	Japan
Weight	2.7 kg
Dimensions	19-inch rack-mountable, standard board depth
OperatingTemp	-20 to 70 degC
PowerConsumption	Up to 500 mA @ 24 VDC
Number of Outputs	8 x 2 dry contact outputs
Output Type	Dry contact via built-in safety relays
Terminal Type	M4 screw/pressure clamp terminals
Maximum Contact Voltage/Current	DC: 30 VDC / 4 A, AC: 240 VAC / 4 A
Insulation Resistance	Minimum 20 MΩ at 500 VDC
Dielectric Withstanding Voltage	2000 VAC between terminals and chassis for 1 min
Humidity	5% to 85% RH, non-condensing
Safety Compliance	SIL2 for De-energized-To-Safe outputs (IEC 61508)

Process Control & Channel Isolation

The SRM53D-000/BR4 supports channel-to-channel isolation to prevent signal interference between digital outputs. It integrates with ProSafe-RS digital modules, maintaining separation between control logic and field device circuits. The design accommodates FOUNDATION Fieldbus and Profibus PA connectivity where required, ensuring cold junction compensation (CJc) is maintained for analog-to-digital interfacing in hybrid control loops.

Frequently Asked Questions

Q: Does the board support hot-swapping of modules?
A: No, the SRM53D-000/BR4 is not rated for hot-swap; modules must be powered down before removal or insertion to maintain safety integrity.

Q: What is the delay when switching outputs under SIL2 configuration?
A: The switching delay is determined primarily by the safety relay response and internal contact propagation; nominal switching time is within 10 ms per channel under standard load.

Q: Can firmware updates affect the terminal board operation?
A: The terminal board is a hardware relay interface and does not contain firmware; digital modules controlling it may require firmware updates separately, but the board itself does not require flash updates.

Field Installation Guidelines

• Mount the board on a standard 19-inch rack ensuring all grounding points are connected to protective earth.
• Ensure all field wiring uses twisted-pair or shielded cables for dry contact outputs to reduce EMI.
• Follow Yokogawa recommended torque settings for M4 terminals to prevent loose connections.
• Maintain separation between power supply lines and signal lines to prevent induction noise.
• Avoid bending terminals beyond recommended angles to preserve mechanical integrity.

Specifications

• Brand: Yokogawa

Advantages

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