Overview
Output Configuration
The SRM53D provides 16 dry contact outputs in an 8-channel x 2 configuration. Each output uses relay contacts to switch external loads according to the connected control signals. The rated contact capacity depends on the load voltage; therefore, users should check both voltage and current limits when selecting connected devices.
The board supports dual-redundant configurations. Furthermore, the read-back function can use the SDV531 or SDV144 connection module, subject to the applicable system configuration.
Electrical and Connection Requirements
The board uses M4 screw terminals for external connections. Two 16-pole terminal groups handle the outputs, while a separate 2-pole terminal provides the 24 VDC external supply. In addition, the board connects to external equipment through the dedicated AKB331 signal cable.
The insulation specifications define the electrical separation between the field device terminals, power terminals and case. These withstand-voltage ratings should be considered when checking the electrical installation requirements.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | SRM53D-000/BR4 |
| Brand | Yokogawa |
| Product Type | Relay Board |
| Function | Digital Contact Output |
| Output Configuration | 8 channels x 2 |
| Output Type | Dry Contact Output |
| Safety Integrity Level | SIL 2 |
| Rated Output Voltage | 250 VAC / 2 A; 125 VDC / 0.4 A; 30 VDC / 2 A |
| External Supply Voltage | 24 VDC (+5%, -3.1%) |
| External Supply Current | Up to 1500 mA |
| Connection Modules | SDV531, SDV144 (read-back) |
| Redundancy | Dual-redundant configuration supported |
| External Signal Cable | AKB331 |
| Output Terminals | M4 screws, 16 poles x 2 |
| Power Terminals | M4 screws, 2 poles x 1 |
| Withstand Voltage (Field Terminals to Case) | 2 kV for 1 minute |
| Withstand Voltage (24 V Power Terminal to Case) | 500 V for 1 minute |
| Withstand Voltage (24 V Power Terminal to Field Terminals) | 2.5 kV for 1 minute |
| Insulation Resistance | 10 MΩ minimum at 500 VDC |
| Operating Temperature | -20 to 70 deg C |
| Ambient Humidity | 5 to 85% RH |
| Weight | 2.7 kg |
| Mounting | 19-inch rack mountable |
| Mounting Option | Wall-mount bracket (/BR4) |
Ordering Configuration
The complete model number SRM53D-000/BR4 identifies the selected relay board configuration.
- SRM53D: Single or dual-redundant relay board with digital output.
- -0: Suffix code, always 0.
- 0: 19-inch rack-mountable configuration.
- 0: Basic option code.
- /BR4: Wall-mount bracket option.
Frequently Asked Questions
Q: How many output channels does the SRM53D provide?
A: The SRM53D provides 16 dry contact outputs, arranged in two groups of 8 channels. Each channel has specified AC and DC contact ratings.
Q: Which connection modules support the SRM53D?
A: The specified connection modules are SDV531 and SDV144. The SDV144 is identified for read-back functionality. Dual-redundant configurations are also supported.
Q: What cable is required for external connections?
A: The SRM53D uses the dedicated Yokogawa AKB331 signal cable for external connections. Check the required cable configuration against the installed system before replacement.
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