NT625-KBA01 Omron, NT625-KBA01 Datasheet - Page 45

• Manufacturer Part Number: NT625-KBA01
• Description: NT631 CHEM RESISTANT COVER
• Manufacturer: Omron

Specifications of NT625-KBA01

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

NT Link
NT Link is a high-speed serial protocol designed specifically for Omron HMI to Omron PLC communications. The protocol operates at
38.4 or 115.2 kbaud, the highest speed serial network in the industry. More importantly, it is not an ASCII based message. The message
is very compact, addressing the words and bits in PLC memory directly. Combine a high baud rate with compact messaging and you
have spectacular speed.
Compare this to Omron’s open Host Link protocol, the protocol used by non-Omron HMI to communicate to Omron PLC serial ports.
Host Link serial protocol operates at a maximum speed of 19.2 kbaud, and messages are transmitted using ASCII character
representations of numbers. The slow baud rate combined with the larger message size translates into perceivably slower performance.
The speed of NT Link translates into an increased sense of control. Operators have the sense of almost immediate response from the PLC
logic and outputs. Updates report so quickly that it is almost like watching the inside of the PLC in real-time. The operator is in control.
There many ways in which NT Link can be used for HMI to PLC communications. They are: NT Link 1:1, NT Link 1:N, and High Speed NT
Link 1:N. Omron PLCs support the following protocols:
NT Link 1:N Connection
The NT Link 1:N connection allows up to 8 NT units to be
connected to a single PLC serial/peripheral port. This feature is
supported only on the CS1/CJ1 PLC platforms, which can have up
to 34 total serial ports (2 on CPU plus 16 serial communication
modules with 2 ports each.) That means a CS1 or CJ1 can connect
to over 272 NT units, all communicating at 115kbaud, and with
responses beating that of a single HMI connected via a Host Link
driver.
NT Link 1:N connections require an RS-422A network. Some NT
units include RS-422A connections (NT31 and NT631), others
require an RS232C to RS422A adapter (NT20S, NT600S, NT21).
PLC Family
CPM1A
CPM2A/B/C
CQM1H
CJ1
CS1
Connection
CPM1-CIF##
Peripheral Port
CPM2C-CIF##
CPU11 Peripheral
CPU21 Peripheral
CPU21 Serial
CPU51/61 Peripheral
CPU51/61 Serial
CPU51/61 Serial Exp
CPU Peripheral
CPU Serial
CJ1W-SCU#1
CPU Peripheral
CPU Serial
CJ1W-SCU#1
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Host Link
19.2 kbaud
Yes
Yes
Yes
No
No
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
NT Link 1:1
38.4 kbaud
Technical Highlights
NT Link 1:N
38.4 kbaud
N = 8 max
No
No
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
High Speed
NT Link 1:N
115.2 kbaud
N = 8 max
No
No
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
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