Yokogawa ALP121-S00 CENTUM VP PROFIBUS-DP Communication Module

Configured for PROFIBUS-DP data exchange in Yokogawa CENTUM VP systems, the Yokogawa ALP121-S00 (ALP121-S00 PROFIBUS-DP Communication Module) provides an RS-485 communication interface between the control system and PROFIBUS-DP slave devices.

Suffix Breakdown & Model Matrix

The supplied data identifies S2 as the hardware style associated with the ALP121-S00. No further functional breakdown of the S00 suffix is specified, so no additional suffix interpretation is assigned.

Hardware Specifications

PROFIBUS-DP and RS-485 Communication

The ALP121-S00 uses an EIA RS-485 physical interface for PROFIBUS-DP communication. It supports transmission speeds from 9,600 bps to 12 Mbps. At 9,600 bps, the supplied data specifies a maximum transmission distance of 1.2 km.

The module operates as a PROFIBUS-DP master and exchanges data with connected slave devices. These devices can include remote I/O, transmitters, actuators, and drives when their PROFIBUS-DP interfaces match the configured network.

Galvanic isolation separates the field communication circuits from the internal system. Therefore, installation should maintain the specified cable, termination, shielding, and grounding practices for the PROFIBUS network.

Frequently Asked Questions

Q: What physical communication interface does the ALP121-S00 use?
A: The module uses an EIA RS-485 interface with one D-sub 9-pin female connector.

Q: What PROFIBUS-DP transmission speeds does the module support?
A: The supplied specification lists speeds from 9,600 bps to 12 Mbps.

Q: What is the maximum stated transmission distance?
A: The supplied data specifies up to 1.2 km at 9,600 bps. The allowable distance decreases as the transmission speed increases.

Field Installation Guidelines

• Install the ALP121-S00 in the specified Yokogawa CENTUM VP or compatible FCS architecture.
• Verify the module model and Style S2 designation before installation.
• Connect the PROFIBUS-DP network through the specified D-sub 9-pin interface.
• Use PROFIBUS-compatible RS-485 cabling and maintain the network topology specified by the system design.
• Keep communication cables separated from high-voltage and high-current wiring to reduce electromagnetic interference.
• Apply cable shielding and grounding according to the Yokogawa installation documentation and site grounding standard.
• Verify PROFIBUS network termination at the appropriate physical endpoints.
• Confirm the configured baud rate and connected slave-device parameters before commissioning.
• Check the communication status between the ALP121-S00 and connected PROFIBUS-DP devices after startup.
• Do not assign additional electrical or environmental limits that are not stated in the applicable Yokogawa documentation.