Description

Yokogawa ALP111-S00 PROFIBUS-DP Communication Module

The Yokogawa ALP111-S00 also cataloged as the ALP111 PROFIBUS-DP Communication Module operates as a dedicated hardware component for cyclic data exchange over PROFIBUS-DP networks within distributed control and fieldbus interface systems.

Configured for PROFIBUS-DP field device communication in DCS architectures, the Yokogawa ALP111-S00 (ALP111 PROFIBUS-DP Communication Module) provides direct electrical implementation based on RS-485 physical layer signaling with galvanically isolated transmission paths.

Yokogawa PROFIBUS-DP integration architecture is reflected in the module design, supporting deterministic master-slave communication over shielded twisted pair transmission media with configurable baud rates.

Suffix Breakdown & Model Matrix

• ALP111: Base communication module series for PROFIBUS-DP interface
• S00: Hardware revision / configuration variant identifier (no further breakdown defined in provided data)

Hardware Specifications

Parameter	Specification
ModelBrand	Yokogawa ALP111-S00
PowerConsumption	0.7 A max
Communication Protocol	PROFIBUS-DP
Physical Layer	EIA-RS-485 compliant
Transmission Speed	9600 bps to 12 Mbps
Transmission Media	Shielded twisted pair
Max Segment Distance	1.2 km at 9600 bps
Communication Port	1 x D-sub 9 female
Maintenance Port	D-sub 9 male, RS-232C interface
Signal Isolation	Isolated

PROFIBUS-DP Fieldbus Interface and Isolation Architecture

The module implements RS-485 differential signaling with electrical isolation between communication domain and internal logic domain. Transmission stability is maintained through shielded cabling with controlled impedance matching for PROFIBUS-DP segment topology. The isolated design reduces ground potential coupling between field devices and control rack backplane interfaces. Baud rate selection from 9600 bps to 12 Mbps enables adaptation to network segment length and device density constraints.

Frequently Asked Questions

Q: Can the ALP111-S00 support mixed baud rate PROFIBUS-DP segments?
A: PROFIBUS-DP segments must operate at a unified baud rate. The module follows master-defined network timing and does not independently arbitrate multiple rates on a single segment.

Q: Does the module support hot insertion during operation?
A: Hot swap behavior depends on system rack design. Electrical insertion under powered backplane conditions must comply with Yokogawa system carrier specifications to avoid bus disturbance.

Q: What is the role of signal isolation in this module?
A: Isolation separates RS-485 field bus electrical domain from internal circuitry, reducing susceptibility to ground offset and common-mode voltage interference.

Field Installation Guidelines

Install the module into the designated Yokogawa I/O or communication rack slot with power isolated prior to insertion. Use shielded twisted pair cabling for PROFIBUS-DP trunk and ensure continuous shield termination at defined grounding points only. Avoid star topology wiring; maintain linear bus structure with proper termination resistors at both ends of the segment. Maintain separation between communication cables and high-voltage conductors to reduce induced noise coupling.

Ensure maintenance port (RS-232C) access is reserved for configuration and diagnostics only, with controlled disconnection after commissioning.

Specifications

• Brand: Yokogawa

Advantages

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