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MELSEC-Q
4 SETTINGS AND PROCEDURES PRIOR TO OPERATION
(a) Transmission setting (CH1 side: switch 1 (lower level); CH2 side: switch 3
(lower level))
b7 b6
b5
b4
b3
b2
b1
b0
CH1 side
CH2 side
Bit
Description
OFF (0)
ON (1)
Remarks
b0
Operation setting
Independent
Link
Must be set to OFF on CH1
b1
Data bit
7
8
Parity bit is not included
b2
Parity bit
NO
Yes
Vertical parity
b3 Even/odd
parity
Odd
Even
Valid only when parity bit is set to
Yes
b4 Stop
bit
1
2
—
b5
Sum check code
NO
Yes
—
b6
Write during RUN
Prohibited
Allowed
—
b7 Setting
modifications Prohibited Allowed
—
All items listed in the table should be set to OFF for the interfaces for which
"GX Developer connection" is set in the communication protocol setting.
The Q series C24 operates with the values set in GX Developer. (See below.)
Transmission setting
Setting description for GX Developer
Operation setting
Independent
Data bit
8
Parity bit
Yes
Even/odd parity
Odd
Stop bit
1
Sum check code
Yes
Write during RUN
Allowed
Setting modifications
Allowed/Prohibited
1) Operation setting
• This sets whether to use each of the two Q series C24 interfaces for
independent data communication, or to use the two for linked data
communication.
• The setting and data flow for linked operation is explained in (2).
2) Data bit setting
• This sets the bit length for one character in data communicated with an
external device according to the specifications of the external device.
(When data communication is performed using format 5 of the MC
protocol (for binary code communication), it is necessary to set it to 8
bits when processing the sum check code with the bidirectional
protocol.)
• If 7 bits are set, the data is communicated by ignoring the most
significant bit (8th bit).
3) Parity bit setting
• This sets whether or not a parity bit (vertical parity) is added for one
byte of transmission/receive data, according to the specifications of
the external device.
• The addition of the parity bit to the transmission data and the checking
of the parity bit of receive data are performed by the Q series C24.
Содержание MELSEC QJ71C24
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