ALR111-S51 RS-232 Yokogawa Communication Module Technical Manual
Manufacturer: Yokogawa
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Part Number: ALR111-S51
Condition：New with Original Package
Product Type: Communication Modules
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Country of Origin: Japan
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
Yokogawa ALR111-S51 Communication Module
The Yokogawa ALR111-S51, also cataloged as the ALR111-S51 RS-232 Communication Module, operates as a dedicated hardware component for serial data exchange between Field Control Station (FCS) subsystems and external serial devices within industrial control networks.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | ALR111-S51 |
| Brand | Yokogawa |
| Origin | Japan |
| Weight | 0.3 kg |
| Dimensions | 12.7 x 5.1 x 12.7 cm |
| Operating Temp | 0 deg C to +55 deg C |
| Power Consumption | Not specified |
| Power Supply | System bus powered |
| Interface | RS-232C (Half-duplex) |
Process Control and Communication Integrity
The ALR111-S51 facilitates serial connectivity by translating subsystem protocols into standardized RS-232C data frames. The module supports configurable baud rates from 300 to 19,200 bps, allowing for integration with various legacy controllers and instrumentation. Data transmission integrity is maintained through built-in communication error detection, which flags framing or parity faults to the host FCS. To ensure deterministic network operation, users must verify that the protocol configuration and parity settings (None, Odd, Even) align with the specific requirements of the connected FA-M3 or CENTUM VP controller logic.
Frequently Asked Questions
Q: Does the module support full-duplex communication?
A: No, the ALR111-S51 interface is strictly limited to half-duplex communication mode for point-to-point serial connections.
Q: How are transmission errors reported to the host system?
A: The module executes internal self-diagnostics; communication errors are detected and propagated as status bits to the control station database, allowing for logic-based fault handling in the application layer.
Field Installation Guidelines
- Mounting: Secure the module within the designated Yokogawa control cabinet slot. Ensure the backplane connector is fully seated to maintain power and communication bus stability.
- Cabling: Utilize shielded RS-232 cabling to prevent electromagnetic interference (EMI) ingress. Ensure the cable length does not exceed standard RS-232 physical limitations (typically 15 meters) to avoid signal attenuation.
- Grounding: Bond the cable shield to the cabinet earth ground at the terminal side to minimize ground loop currents. Do not connect the shield at both ends if a potential difference exists between device grounds.
- Environment: Maintain ambient temperatures between 0 deg C and +55 deg C. Ensure the module is protected from high-humidity environments, as the unit is not sealed against water ingress.