INTRODUCTION TO THE COM SERIES

COM is a name of communication converters that make communication of our controllers easier.There are two types of COM converters; one is for communication level converter and the other is a communication protocol converter. Please select whichever is suitable for your applications.

COMMUNICATION LEVEL CONVERTER

COM-A : RS-232/422 Converter
COM-B : RS-232/485 Converter (For use with MS-DOS only)


COMMUNICATION PROTOCOL CONVERTER

COM-E

Automatically converts the protocol used in RKC controllers (REX-F, CB Series, SA200, and LE100) into the PLC protocol and writes the data into the PLC's registers. This eliminates the need for communication program development on the PLC side.


COM-G

Converts protocols between RKC standard/ANSI and Profibus.
Converts the protocol used in RKC controllers (REX-F, CB series, SA200, LE100) into the Profibus-DP protocol. This makes RKC controllers work as a slave of Profibus-DP.


COM-H


This is a communication protocol converter  between SR Mini multi-loop controllers and PLC  that are connected via DeviceNet, and converts protocols between RKC standard/ANSI and DeviceNet.


Profibus-DP: is used in time-critical applications between an automation system and distributed devices (remote I/O, inverter, etc.). Profibus-DP is also defined as IEC61158 and EN50170.

DeviceNet is a low-cost industrial network to connect industrial devices such as limit switches, photoelectric cells, valve manifolds, motor starters, drives, and operator displays to PLCs and PCs. The network eliminates expensive hard-wiring while providing device-level diagnostics. ODVA is the organization that manages the DeviceNet technology and promotes the worldwide adoption of DeviceNet in industrial automation.

THE SYNERGETIC FIELDBUS COMPARISON CHART


BACKGROUND INFORMATION

Fieldbus Name Technology Developer Year Introduced Governing Standard Openness
PROFIBUS  DP/PA Siemens DP-1994, PA-1995 EN 50170 / DIN 19245 part 3(DP) /4 (PA), IEC 1158-2 (PA) ASICs from Siemens and Profichip, Products from over 300 vendors
INTERBUS-S Phoenix Contact, Interbus Club 1984 DIN 19258
EN 50.254
Products from over
400 manufacturers
DeviceNet Allen-Bradley March 1994 ISO 11898 &11519 17 chip vendors, 300+ product vendors, Open specification
ARCNET Datapoint 1977 ANSI/ATA 878.1 Chips, boards, ANSI docs
AS-I AS-I Consortium Fall 1993 Submitted to IEC AS-II.C. Market item
Foundation Fieldbus H1 Fieldbus Foundation 1995 ISA SP50/IEC 61158 Chips/software/products from multiple vendors
Foundation Fieldbus High Speed Ethernet (HSE) Fieldbus Foundation In development - lab test phase, Prelim spec available to members IEEE 802.3u
RFC for IP, TCP & UDP
Multitude of suppliers for Ethernet components, Extremely low cost 
IEC/ISA SP50
Fieldbus
ISA & Fieldbus F. 1992 - 1996 IEC 1158/ANSI 850 Multiple chip vendors
Seriplex APC, Inc. 1990 Seriplex spec Chips available multiple interfaces
WorldFIP WorldFIP 1988 IEC 1158-2 Multiple chip vendors
LonWorks Echelon Corp. March 1991 --- Public documentation on protocol
SDS Honeywell Jan., 1994 Honeywell Specification, Submitted to IEC, ISO11989 17 chip vendors,
100+ products
ControlNet Allen-Bradley 1996 ControlNet International Open Specification, 2 Chip Vendors
CANopen CAN In Automation 1995 CiA 17 chip vendors, 300 product vendors, Open specification
Ethernet DEC, Intel, Xerox 1976 IEEE 802.3, DIX v. 2.0 Multitudes of Chips and Products
Modbus Plus Modicon --- --- Proprietary, requires license/ASICs
Modbus RTU/ASCII Modicon --- EN 1434-3 (layer 7)
IEC 870-5 (layer 2)
Open specification, no special hardware required
Remote I/O Allen-Bradley 1980 --- Proprietary
Data Highway Plus (DH+) Allen-Bradley --- --- Proprietary

Source: Fieldbus Comparison Chart - http://www.synergetic.com/compare.htm