YNT512D

The Yokogawa YNT512D is a bus repeater designed to extend communication distances in Yokogawa control system networks. It regenerates bus communication signals between network segments, supporting V net and RIO bus configurations. The unit supports dual-redundant bus arrangements and is available in different configurations for 10BASE-2 and 10BASE-5 cable systems.

Network Extension and Signal Repeating

The YNT512D connects two sections of a communication bus to extend the physical transmission distance. It receives communication signals through one transceiver section and retransmits them through the other, allowing network stations to communicate across longer cable runs.

Yokogawa documentation identifies the YNT512D as a bus repeater for V net and RIO bus in the CENTUM CS system. It is also documented for V net extension in ProSafe-RS configurations.

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Dual-Redundant Configuration

The repeater is designed for dual-redundant bus arrangements, with separate Bus 1 and Bus 2 paths. Its documented hardware configuration includes:

• AIP171 controller unit.
• Two AIP571 electrical transceiver units.
• Power supply units.
• Bus connector assemblies.

The two communication paths maintain the corresponding bus separation within the redundant network architecture.

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Transmission Distance and Cable Configuration

For V net applications, the transmission distance depends on the cable type and the specific YNT512D configuration.

The manufacturer documents three V net configuration codes:

Model	Specification
YNT512D-P	Dual-redundant V net, 10BASE-2
YNT512D-V	Dual-redundant V net, 10BASE-5
YNT512D-Q	Dual-redundant V net, 10BASE-2 to 10BASE-5 conversion

One repeater extends the transmission distance by up to 185 m for 10BASE-2 or 500 m for 10BASE-5. Up to eight repeaters can be used between two V net stations, subject to the manufacturer's total-distance restrictions.

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Yokogawa specifies YCB141 cable for 10BASE-2 and YCB111 cable for 10BASE-5 in the referenced communication-device manual. These are proprietary V net cable specifications; the 10BASE terminology is used for comparison and does not mean that V net is standard Ethernet.

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Power Supply Configuration

The documented bus repeater assembly supports three power supply unit options:

• PW501: 100-120 V AC.
• PW502: 220-240 V AC.
• PW504: 24 V DC.

The required power supply must match the installed unit and the available cabinet power distribution.

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Technical Specifications

Parameter	Specification
Model	YNT512D
Brand	Yokogawa
Product Type	Bus Repeater
Network Applications	V net, RIO bus
Bus Configuration	Dual-redundant
Communication Interface	Electrical transceiver
Transceiver Model	AIP571
Controller Model	AIP171
Power Supply Options	100-120 V AC, 220-240 V AC, 24 V DC
Connector Assembly	S9764UK (10BASE-2), S9628UK (10BASE-5)
Maximum Extension per Repeater	185 m (10BASE-2); 500 m (10BASE-5)
Maximum Repeaters Between V net Stations	8, subject to cable and total-distance restrictions

Frequently Asked Questions

Q: Can the YNT512D be used in a dual-redundant communication network?

A: Yes. The YNT512D is documented for dual-redundant bus configurations, with separate transceiver paths for Bus 1 and Bus 2.

Q: What is the difference between YNT512D-P, YNT512D-V and YNT512D-Q?

A: The suffix identifies the V net cable configuration. P is for 10BASE-2, V is for 10BASE-5, and Q supports conversion between the two cable types. The suffix must be checked when selecting a replacement.

Q: Can the YNT512D extend a V net connection beyond 500 m?

A: Yes. Multiple repeaters can extend the network beyond the distance supported by one repeater. However, the maximum number of repeaters and total transmission distance depend on the cable configuration.

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