It is not possible to connect multiple devices with different communication speeds and parities.

You can use a Q series 18-point screw terminal block with a MELSEC iQ-R series terminal block type I/O module or analog

The number of modules that can be synchronized is as follows. - In single CPU system configuration: 64 modules - In mult

Although it depends on interrupt factors, the overhead time before startup becomes 10.8 to 23.8 [us] and the time after

Specify the file in the Write to PLC window and execute writing.

If comments cannot be stored in the program memory, write them in the standard ROM or a memory card. Calculate the memor

It is necessary to install a development environment (Tornado or Wind River Workbench) and set parameters using the Set

The maximum number of steps that an online change can process at a time is 512.

Select [Target Memory] -> [Standard ROM] in the Read from PLC window.

Indirect specifications with "＠" cannot be used in structured ladder programs and the Structured Text. Use indirect spec

FAQ

FAQAbout Products

Font Size
S
M
L

FAQ > Controllers > Programmable Controllers MELSEC

FAQ

Inquiries

Keyword Search

You can search two or more words separated by a space.

 AND : Put a space between the words in a keyphrase.
 OR  : Add a vertical bar ( | ) between the words in a keyphrase.
 NOT : Add a minus sign ( - ) followed by the words that you would like to exclude.

Result Type

Text Search

Programmable Controllers MELSEC

MELSEC iQ-R Series(45)
MELSEC iQ-F Series(672)

CPU Module(185)
I/O Module(5)
Analog(16)
High-Speed Counter(14)
Motion/Positioning(11)
Network/Communication(106)
Option(9)
Engineering Software(62)
Safety Control(1)

Engineering Software(129)

FAQ within [ Programmable Controllers MELSEC ]

381-390 of Total 1023

prev 39 / 103page next

Regarding protocol mixing in Serial Communication

It is not possible to connect multiple devices with different communication speeds and parities. More Details >>
- No：45480
- Release Date：2025/11/12 13:54
- Category： MELSEC iQ-F Series , CPU Module , Network/Communication
Using Q series terminal blocks and connectors with MELSEC iQ-R series modules

You can use a Q series 18-point screw terminal block with a MELSEC iQ-R series terminal block type I/O module or analog module. For a 40-pin connector type ... More Details >>
- No：22474
- Release Date：2018/09/03 17:28
- Update：2018/09/19 14:37
- Category： MELSEC iQ-R Series
Number of modules that can be synchronized using the MELSEC iQ-R series inter-module synchronization function

The number of modules that can be synchronized is as follows. - In single CPU system configuration: 64 modules - In multiple CPU system configuration: 57 t... More Details >>
- No：22496
- Release Date：2018/09/03 17:28
- Update：2018/09/21 17:15
- Category： MELSEC iQ-R Series
Overhead time before and after the startup of an interrupt program with a MELSEC iQ-R series CPU module

Although it depends on interrupt factors, the overhead time before startup becomes 10.8 to 23.8 [us] and the time after startup becomes 6.5 to 17.4 [us]. More Details >>
- No：22499
- Release Date：2018/09/03 17:28
- Update：2018/09/20 12:14
- Category： MELSEC iQ-R Series
How to write to file registers in Q series

Specify the file in the Write to PLC window and execute writing. More Details >>
- No：22585
- Release Date：2018/09/03 17:29
- Category： MELSEC-Q Series
PLC write not possible due to memory overload

If comments cannot be stored in the program memory, write them in the standard ROM or a memory card. Calculate the memory capacity in GX Works2 or GX Develo... More Details >>
- No：22595
- Release Date：2018/09/03 17:29
- Update：2018/09/20 17:49
- Category： MELSEC-Q Series
Procedure for developing programs

It is necessary to install a development environment (Tornado or Wind River Workbench) and set parameters using the Setting/monitoring tools for the C Cont... More Details >>
- No：22600
- Release Date：2018/09/03 17:29
- Update：2018/09/21 18:52
- Category： MELSEC-Q Series
The numbers of POUs and steps of "Allocate Memory for 'Online Change'" in GX Works2

The maximum number of steps that an online change can process at a time is 512. More Details >>
- No：22672
- Release Date：2018/09/03 17:29
- Category： MELSEC-Q Series
How to read comments in the standard ROM with GX Works2

Select [Target Memory] -> [Standard ROM] in the Read from PLC window. More Details >>
- No：22673
- Release Date：2018/09/03 17:29
- Update：2018/09/21 14:05
- Category： MELSEC-Q Series
Whether or not device indirect specifications in structured ladder programs are allowed

Indirect specifications with "＠" cannot be used in structured ladder programs and the Structured Text. Use indirect specifications in a ladder language program. More Details >>
- No：22697
- Release Date：2018/09/03 17:29
- Category： MELSEC-Q Series

381-390 of Total 1023

Inquiries

page top