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Price before currency correction
€ 548,00
Price after currency correction
€ 546,36
Quantity per package: 1

Serial remote I/O master module for DL405 PLC

The DL405 offers full-size remote I/O. The goal of remote I/O is to reduce wiring costs by allowing I/O points to be located near the devices they are controlling. The D4-450 has the D4-RM functionality built into the 25-pin port directly on the CPU. However, you can also choose to use the D4-RM.

Here’s how it works:
A special module called the Remote Master is placed in the CPU base. This Master module controls up to seven Remote Slaves. The Remote Slaves are connected to the Master in a daisy-chain manner over a twisted pair communication cable (maximum length 1200m). Each Remote Slave attaches to a DL405 base (any size). Standard DL405 modules populate the remote bases.

You can assign normal input and output addresses to the remote points, or you can assign special remote I/O addresses. The Remote Master sends the remote I/O information to the CPU. The communication between the Remote Master and the CPU is asynchronous to the CPU scan. For this reason, remote I/O applications should be limited to those that do not require the remote I/O points to be updated with every CPU scan.

This product is equivalent to: Texas Instruments / Simatic TI: 405-LIC / U-02RM



Serial remote I/O master

Specifications of the D4-RM:

  • Remote I/O masters (D4-RM) per system: 2 (D4-430/D4-440) or 3 (D4-450) max.
  • Number of slaves (D4-RS) per master: 7 max.
  • Baud rate: 38.4K baud max.
  • Distance: 1.2km max. (depending on baud rate)


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