Comparing Legacy (S908) Remote I/O Drops with Ethernet Remote I/O Drops

Introduction

In a Quantum EIO configuration, you can use both Ethernet remote I/O drops and . However, in order to benefit from Ethernet capabilities offered by a Quantum EIO system, you can migrate the legacy (S908) remote I/O system to .

Comparing Legacy (S908) Remote I/O and Ethernet Remote I/O

The table below provides a comparison of the modules with the Ethernet remote I/O modules, focusing on their commonality – they are both Quantum remote I/O modules.

	Legacy (S908) Remote I/O	Ethernet Remote I/O
local head module	140CRP93•00	140CRP31200
local head module configuration	Control Expert configuration on the local rack without parameters	Control Expert configuration on the local rack with network parameters
connectivity network protocol	proprietary	EtherNet/IP
remote I/O modules	800 series I/O Quantum remote I/O SY/MAX	Quantum remote I/O
Quantum remote I/O drops
drop configuration	parameters for module status data	parameters for module status data
racks	140 XBP 002 00 140 XBP 003 00 140 XBP 004 00 140 XBP 006 00 140 XBP 010 00 140 XBP 016 00	140 XBP 002 00 140 XBP 003 00 140 XBP 004 00 140 XBP 006 00 140 XBP 010 00 140 XBP 016 00
drop adapter module	140CRP93•00	•••CRA31200
drop adapter module configuration	Control Expert configuration on the remote rack without parameters	Control Expert configuration on the remote rack with network parameters
drop module types	supply discrete analog counting communication (XBE) expert (ERT and ESI)	supply discrete analog counting communication (XBE) expert (ERT and ESI)
module I/O mapping	bit address (flat addressing)	bit address (flat addressing)
improving response time	using section scheduler	using IU_EIO function block
remote I/O in project file	STU + STA + PLC (ETS) + XEF	STU + STA + PLC (ETS) + XEF + ZEF
diagnostic	bus diagnostic (drop, rack, module) based on %SW180-%SW339	bus diagnostic (drop, rack, module) based on %SW152-%SW153 (drops), %SW172-%SW173 (drops), and %SW641-%SW702 (modules) and using explicit messaging
CCOTF	Available with Unity Pro 5.0 or later	Available with Unity Pro 6.0 or later NOTE: Unity Pro is the former name of Control Expert for version 13.1 or earlier.

NOTE:

Ethernet remote I/O drops can support more I/O modules than a legacy (S908) remote I/O drop:
- A legacy (S908) remote I/O drop is limited to 64 input words and 64 output words.
- An Ethernet remote I/O drop is limited to 800 input bytes (400 input words) and 800 output bytes (400 output words).
When you replace legacy (S908) remote I/O drops with Ethernet remote I/O drops, if the global number of remote I/O modules is the same, you may reduce the number of Ethernet remote I/O drops to optimize network performance.