Overview

CUnet is a multi-master remote I/O control network capable of digital I/O, analog I/O, and positioning control.
It can connect up to 64 nodes and share up to 512 bytes of data while enabling I/O control.
By using CUnet, you can not only control DIOs, but also perform analog control via serial communication in a simple and inexpensive way, replacing traditional parallel connections.

Furthermore, for motor control within the device, positioning control using an I/O-level network is also possible, provided that the positioning control is within the range supported by CUnet (MKY44MC series).
This allows you to use CUnet (MKY44MC series) to change control systems that previously used expensive motor drivers and servo motors to a more cost-effective configuration.

CUnet is a network that aims to do what can be done at the I/O level, at the I/O level!
This ensures appropriate cost, speed, and noise immunity for I/O control within the device.

Features

- Multi-master/multi-slave configuration
• Up to 64 nodes can be connected.
- Up to 512 bytes of shared memory
- Supports digital I/O, analog I/O, and positioning control.
RS485-based network
The CPU can be controlled solely by reading and writing to shared memory.
• Also suitable for motor control applications (MKY44MC series)

series name	MEM mode IC (Master/Slave)	MEM mode IC (Master/Slave)	MEM mode IC (Master/Slave)	IO mode IC (DIO slave)	IO mode IC (DIO slave)
Model number	MKY43	MKY49	MKY44-SPI	MKY46	MKY44-IO32A
package
function	Data (memory) share	Data (memory) share	Data (memory) share	32DIN/DOUT	32DIN/DOUT with filter ・2-channel 24-bit up/down counter (encoder) ・2-channel 16-bit PWM output
Operating voltage	3.3V (5V tolerant)	3.3V	3.3V	5.0V	3.3V
Features	• Email functionality supported (256 bytes of data transmission) ・Supports 16/8-bit bus interface	• Email functionality supported (256 bytes of data transmission) SPI I/F compatible SPI clock 16.6MHz (max)	• Email functionality supported (256 bytes of data transmission) SPI I/F compatible SPI clock 1MHz (max)	・CPU not required - 32DIN/DOUT can be switched in 4-bit increments.	・CPU not required - 32DIN/DOUT can be switched in 8-bit increments. • ST44SW: Required

series name	IO mode IC (AD slave)	IO mode IC (AD slave)	IO mode IC (AD slave)	IO mode IC (DA slave)	IO mode IC (DA slave)
Model number	MKY44-AD12A	MKY44-AD16A	MKY44-AD16B	MKY44-DA16A	MKY44-DA16B
package
function	Data (memory) share	Data (memory) share	Data (memory) share	32DIN/DOUT	32DIN/DOUT with filter ・2-channel 24-bit up/down counter (encoder) ・2-channel 16-bit PWM output
Operating voltage	3.3V	3.3V	3.3V	3.3V	3.3V
Features	・CPU not required • Built-in AD converter ・ST44SW: Not required	・CPU not required External AD converter (AD7682) • ST44SW: Required	・CPU not required External AD converter (AD7682) ・ST44SW: Not required	・CPU not required External DA converter (AD5752) • ST44SW: Required	・CPU not required External DA converter (AD5754) ・ST44SW: Not required

series name	IO mode IC (Positioning slave)	IO mode IC (Positioning slave)	IO mode IC (Slave)	HUB-IC
Model number	MKY44-MC01A	MKY44-MC02A	MKY44-FS00A	MKY02
package
function	24kpps single-axis motor control Rotary encoder input 1ch General-purpose DI/O	12.5kpps motor control, 2 axes Rotary encoder input 2ch General-purpose DI/O	Improved speed during I/O communication	－
Operating voltage	3.3V	3.3V	3.3V	3.3V (5V tolerant)
Features	・CPU not required - Trapezoidal speed control (Acceleration/deceleration: straight line, S-curve) - No interpolation function ・ST44SW required	・CPU not required - Trapezoidal speed control (Acceleration/deceleration: straight line, S-curve) - No interpolation function ・ST44SW required	- Used when communicating between I/O modes	・CPU not required - T-branch and wiring extension possible

series name	Support IC
Model number	ST44SW
package
function	SA, DOSA, and BPS terminal expansion for some MKY44 series models.
Operating voltage	3.3V
Features	Switchable between binary and decimal modes.

*ST44SW is an IC used to "expand the communication setting switch" when using MKY44.

Network Specifications

response speed

*The above response speed is based on the assumption that the self-occupied area of one node is 8 bytes.

Communication range when using a HUB

CUnet network configuration

CUnet is a multi-master:multi-slave remote I/O control network.
Up to 64 CUnet ICs can be connected to this single network, and the master and slaves communicate automatically at all times.

The CUnet IC has both a master IC and a slave IC equipped with 512 bytes of memory, and because it is a data-sharing network,
Once one communication cycle is complete, the memory information of all CUnet ICs becomes identical (data sharing).
Therefore, a CPU connected to the master IC can control the I/O of each slave simply by reading and writing to the master IC's memory.
Network connectivity utilizes multidrop cabling using RS485, but T-branching and cable extension are also possible by using the HUB-IC (MKY02).

special features

① Email function (P2P communication)
Compatible ICs can communicate one-to-one with each other, up to a maximum of 256 bytes.
- Separate system from data sharing
- Does not affect cycle time
- For low-frequency data such as parameter transfer

② GMM (Global Memory Monitor)
This feature allows for secure monitoring while the network is operating.
Shared memory
• Register information

③ Error monitoring function
Communication errors can be checked using registers or error notification bits.
- Which device did it occur on?
Is it continuing?

Inquiry / Quotation

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