TECHNICAL INFORMATION

COMMUNICATION FUNCTION

More than 90% of RKC products are supplied with a communication function, all of which have various types of protocols. In this section, we will introduce you to some protocols that are used in RKC products.

RKC Standard/ANSI Protocol

  • All RKC products with a communication function offer this feature. As the name shows, it is based on ANSI X3.28 sub-category 2.5 A4 or B1.
  • All functions, including initial setting, are covered to simplify instrument set-up.

Ladder Communication (Z-190)
This protocol is useful to reduce the programming on the PLC by the use of a HEX code and non-procedure protocol to communicate with a PLC. This type of communication is used in the SR Mini (H-PCP with Z-190 option).

Modbus (Z-1021)

Modbus is a communication protocol based on Modbus (RTU) by Modicon. By using an integrated protocol, PLC programming can be simplified and reduced while reducing total communication time in the communication between a PLC and many other devices in the field, such as sensors and actuators. The use of RS-485 hardware is cost-effective. This protocol is often used in linking FPD for FA and PA to control devices.
Memobus (Z-1001)

This is a communication protocol used in Yaskawa PLC. This protocol is used in RKC’s SR Mini systems.

Profibus
Profibus-DP protocol, specified by the Foundation of Profibus, is an open network that is designed to handle a large quantity of data at a high speed. RKC offers a COM-G communication converter that can be used with REX-F, CB, SA100/200, LE100 and the SR Mini HG System.

DeviceNet
DeviceNet, specified by ODVA, is an open network designed to handle a large quantity of data at a high speed. RKC offers COM-H communication converter that can be used with REX-F, CB, SA100/200, MA 900/901, LE100 and the SR Mini HG System.

SX bus
This communication is used to connect to SX bus used in a PLC from Fuji Electric. This field bus is designed to handle a large quantity of data at a high speed. RKC offers a special PCP for SX bus in SR Mini HG series, and TIO modules (excluding some modules) can be connected.

Glossary:
FPD: Field Process Device

ODVA: Open DeviceNet Vendors Association. ODVA is the organization that manages the DeviceNet technology and promotes the worldwide adoption of DeviceNet in industrial automation.

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.

INTRO TO 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-K2
COM-K is USB communication converter for RKC products (Communication function : RS-422A or RS-485).
Based on USB Ver. 2.0
Bus power (The power is supplied from the USB port on the PC side.)
Based on RS-485, EIA standard
Based on RS-422A, EIA standard

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.

 

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