Yokogawa ALP121-S00 PROFIBUS-DP Communication Module
Introduction:
This Yokogawa ALP121-S00 is a PROFIBUS-DP communication module for field networks. Features isolated interface, 12 Mbps speed, and 1.2 km distance.
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Product Attributes:
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Product Overview
The Yokogawa ALP121-S00 is a PROFIBUS-DP communication module for industrial field networks. This module connects Yokogawa control systems to PROFIBUS-DP field devices seamlessly. The model ALP121 serves as the base identifier for this communication interface. Suffix code -S designates the standard type for general industrial applications. Suffix code 0 always appears as zero in this part number configuration. Additionally, suffix code 1 confirms the inclusion of the ISA Standard G3 option for harsh environments. The ALP121-S00 features an isolated interface between the field side and the system side. Signal isolation protects the control system from electrical noise and ground loops. One communication port provides connectivity to the PROFIBUS-DP network. This port uses a D-sub 9 pin (female) connector for standard cabling.
Technical Specifications
General Specifications
| Parameter | Value |
|---|---|
| Part Number | ALP121-S00 |
| Model | ALP121 PROFIBUS-DP Communication Module |
| Brand | Yokogawa |
| Condition | New & Original in Factory Packing |
| Weight | 0.3 kg |
Suffix Code Interpretation
| Suffix Code | Parameter | Value |
|---|---|---|
| -S | Type | Standard type |
| 0 | Always | Always 0 |
| 1 | Option | With ISA Standard G3 option |
Communication Specifications
| Parameter | Value |
|---|---|
| Interface | PROFIBUS-DP |
| Connection Method | EIA-RS-485-compliant |
| Signal Isolation | Isolated between field and system |
| Transmission Speed | 9600 bps to 12 Mbps |
| Maximum Transmission Distance | 1.2 km (at 9600 bps communication speed) |
| Number of Communication Ports | One port |
| Communication Port Type | D-sub 9 pin (female) |
| Maximum Current Consumption | 0.7 A |
PROFIBUS-DP Interface
The ALP121-S00 implements the PROFIBUS-DP interface for field device communication. This protocol is widely used for distributed I/O and drive control applications. Connection follows EIA-RS-485 compliance for reliable differential signaling. Signal isolation separates the field side completely from the system side. Consequently, ground loops and electrical noise do not affect the host controller. The Yokogawa ALP121-S00 ensures clean, reliable communication in electrically noisy environments.
Transmission Speed & Distance
Transmission speed ranges from 9600 bps up to 12 Mbps for flexible network design. Lower speeds allow longer cable runs between devices. For example, at 9600 bps, maximum transmission distance reaches 1.2 km. Higher speeds up to 12 Mbps require shorter cable distances accordingly. The ALP121-S00 automatically negotiates speed with connected PROFIBUS-DP devices. For this reason, the module adapts to various network configurations seamlessly.
Communication Port
A single communication port provides connectivity to the PROFIBUS-DP network. This port uses a D-sub 9 pin (female) connector for standard cabling. The female connector mates with male connectors on PROFIBUS cables. Pin assignments follow PROFIBUS-DP standard conventions. Maximum current consumption for the ALP121-S00 reaches only 0.7 A. Low power draw reduces load on the system power supply significantly.
ISA Standard G3 Option
Suffix code 1 confirms the inclusion of the ISA Standard G3 option. This standard addresses corrosion resistance for harsh industrial environments. G3 compliance protects the ALP121-S00 from airborne contaminants like sulfur and chlorine compounds. For chemical plants, refineries, and wastewater treatment facilities, this option proves essential. Therefore, the Yokogawa ALP121-S00 suits demanding environmental conditions reliably.
Signal Isolation Benefits
Signal isolation separates the field PROFIBUS side from the system side completely. This isolation protects the host controller from voltage spikes and ground loops. Noise immunity improves significantly because of this galvanic separation. For long cable runs in electrically noisy environments, isolation proves critical. The ALP121-S00 maintains communication integrity even with significant ground potential differences.
Weight & Physical Characteristics
Weight measures only 0.3 kg for the Yokogawa ALP121-S00. This lightweight design simplifies mounting within control cabinets. The compact form factor fits standard Yokogawa I/O racks conveniently. For system integrators, the low weight allows flexible placement options. The ALP121-S00 occupies minimal space while providing essential PROFIBUS-DP connectivity.
Installation Guidelines
Follow these steps for proper installation of the ALP121-S00.
Power down the control system completely before inserting the module.
Select an available slot in the Yokogawa I/O rack for this communication module.
Insert the ALP121-S00 firmly into the rack until fully seated.
Secure the module using the retaining screws at top and bottom.
Connect the PROFIBUS-DP cable to the D-sub 9 pin (female) port.
Verify proper termination on the PROFIBUS network at both ends.
Power up the system and configure the communication parameters in engineering software.
Set the transmission speed between 9600 bps and 12 Mbps according to network length.
Note: The ALP121-S00 with suffix -S is the standard type with G3 option. Maximum transmission distance of 1.2 km applies only at 9600 bps. Higher speeds require shorter cable runs. Always terminate both ends of the PROFIBUS-DP network.
Packaging List
One Yokogawa ALP121-S00 PROFIBUS-DP Communication Module
One product documentation manual
One anti-static protective bag
Common FAQs
1. What is the transmission speed range of the ALP121-S00?
Transmission speed ranges from 9600 bps up to 12 Mbps. Lower speeds like 9600 bps allow longer cable runs up to 1.2 km. Higher speeds such as 12 Mbps require shorter cable distances accordingly. The Yokogawa ALP121-S00 adapts automatically to the network configuration.
2. Does the ALP121-S00 provide signal isolation?
Yes, this module features signal isolation between the field side and the system side. Galvanic isolation protects the host controller from electrical noise and ground loops. For long PROFIBUS cable runs in industrial environments, isolation proves essential. The ALP121-S00 maintains reliable communication despite ground potential differences.
3. What is the maximum transmission distance of the ALP121-S00?
Maximum transmission distance reaches 1.2 km at the communication speed of 9600 bps. At higher speeds up to 12 Mbps, the maximum distance decreases significantly. Always consult PROFIBUS-DP cabling guidelines for specific speed-distance relationships. The Yokogawa ALP121-S00 supports standard PROFIBUS-DP network topologies.
4. What connector does the ALP121-S00 use?
This module uses a D-sub 9 pin (female) connector for the PROFIBUS-DP port. The female connector mates with standard male PROFIBUS-DP cables. Pin assignments follow PROFIBUS-DP standard conventions for broad compatibility. Therefore, standard PROFIBUS cables work with the ALP121-S00 without modification.
5. What does the ISA Standard G3 option provide on the ALP121-S00?
Suffix code 1 confirms the inclusion of the ISA Standard G3 option for corrosion resistance. This standard protects the module from airborne contaminants like sulfur and chlorine compounds. For chemical plants, refineries, and wastewater treatment facilities, G3 compliance proves essential. The Yokogawa ALP121-S00 with G3 option suits demanding environmental conditions reliably.
Why Choose This Communication Module?
The Yokogawa ALP121-S00 delivers reliable PROFIBUS-DP connectivity for Yokogawa control systems. Transmission speed from 9600 bps to 12 Mbps supports diverse network requirements. Maximum distance of 1.2 km at lower speeds enables remote I/O placement. Signal isolation protects the host controller from electrical noise and ground loops. The ISA Standard G3 option provides corrosion resistance for harsh environments. Low current consumption of 0.7 A reduces power supply loading. For PROFIBUS-DP integration with Yokogawa systems, choose the ALP121-S00.