YOKOGAWA UTAdvanced Series, User Manual

Page: 45 / 866

3-14
IM 05P07A01-01EN

15 Writing to multiple I relays

Function
Data is written to I relays continuously for the specified number of relays from the
specified relay number.
• The maximum number of relays that can be written at a time is 256.
• For details on the response format at an error, see “● Response in an error state” in
“3.1.3 Configuration of Responses (response from UTAdvanced).”
• The data to be written is one bit for each I relay.
The bit indicates: 1 = ON and 0 = OFF. The LSB of the first written data item indicates
the status of the write start I relay.
The status of 8 I relays is represented by one byte. If the maximum number of I relays
is exceeded by the last written data, the exceeding part of the data item is not written.
• Broadcasting can be specified. No response is returned when broadcasting is
specified.

Message (during normal operation)
Element
Message start
mark (:)
Address No.
(ADR)
Function code
(0x0F)
I relay start
No.
Number of I
relays
Byte count
(Note 1)
Number of bytes in RTU mode None 1 1 2 2 1
Number of bytes in ASCII
mode
1 2 2 4 4 2
Continuation of message
Write data • • • Write data Error check
Message
end mark
(CR+LF)
1 • • • 1 2 None
2 • • • 2 2 2
Note 1: When the byte count is assumed to be “N,” N = Number of write I relays / 8 (however, N =
N + 1 when the remainder is not zero).

Response (during normal operation)
Element
Message
start mark
(:)
Address No.
(ADR)
Function code
(0x0F)
I relay start
No.
Number of
I relays
Error
check
Message
end mark
(CR+LF)
Number of bytes in RTU
mode
None 1 1 2 2 2 None
Number of bytes in ASCII
mode
1 2 2 4 4 2 2
3.1 Modbus Communication