Introduction

These guidelines apply to Ethernet remote I/O drops on remote racks.

Racks and Extensions

An Ethernet remote I/O drop can include 2 racks. In a 2-rack drop, the racks are linked with these bus extender modules and cables:

Remote Drop Type

Bus Extender Module

Cable

Quantum

140 XBE 100 00

140 XCA 717 0• (1 to 3 m)

Modicon X80

BMX XBE 1000

BMX XBC •••K (0.8 to 12 m)

Maximum Configuration

Quantum remote I/O drops can include two 16-slot racks for a maxiumum of 32 slots. Modicon X80 remote I/O drops with a BMXCRA312•0 adapter module can support two racks for a maximum of 24 slots.

NOTE: If you use a low-end CPU (140 CPU 6• 1••) (2 Mb or less), you can only install a maximum of 31 remote I/O drops. Of those 31 drops, you can only install a maximum of sixteen BMXCRA312•0 remote I/O drops. If you use a high-end CPU (140 CPU 6•• ••) (4 Mb or more), you can install a maximum of thirty-one BMXCRA312•0 or 140CRA31200 remote I/O drops.

The table shows the maximum number of modules of each type in remote drops:

Module Type

Quantum 140CRA31200

Modicon X80 BMXCRA312•0

remote I/O adapter (note 1)

1

1

power supply (note 2)

2

2

bus extension (note 3)

2

2

I/O

27

23

  • NOTE 1:

    • 140CRA31200: This adapter module consumes 1 slot in the main (first) rack in Quantum remote drops. The extended (second) rack in a Quantum remote I/O drop does not require an adapter.

    • BMXCRA312•0: This adapter module supports a Modicon X80 remote I/O drop with 2 racks when a bus extender module is in both the main and extended racks.

  • NOTE 2: A power supply consumes 1 dedicated slot in each rack in Quantum and Modicon X80 remote I/O drops.

  • NOTE 3: A bus extender module is required for each rack in remote I/O drops. In Quantum remote I/O drops, the bus extender consumes 1 rack slot. In Modicon X80 remote I/O drops, the bus extender attaches to the end of the rack and does not consume a rack slot.

Refer to the list of modules that remote I/O installations support.