Response - Hitachi EH-150 Series Applications Manual

6.4.4

Response

All explanation in this section is the responses at the time of a default (I/O mapping not used) setup.
 Function code 0x01 (Read Coil Status)
For EH-SIO, this function code means "Read status of output (Y)". Broadcasting is not supported.
(1) Query
The start address of the coil and the number of coils are specified in the query message.
« Note »
It is necessary to change the bit number to hexadecimal number. (When using I/O mapping, the bit No. in a module
are hexadecimal number.)
Y u s
For example, when reading from Y100 (u-0, s-1, and bit No.-00), the start address is H0100. When reading from
Y4A10 (u-4, s-A, and bit No.-10), the start address is H4A0A.
(2) Response
Response is sent back automatically according to query. The meaning of the data field bit, with 1 for ON and 0 for
OFF, the first LSB data will be in the state of the specified I/O number. Data is handled as 1 byte. If data less than 1
byte is requested, the rest part will be 0.
« Note »
If requested address or a part of data is not assigned as output, exception response will be returned.
Y100
(4)
(1)
Change to a hexadecimal number
Remains as is
Remains as is
EH-YT32
(1) Set number of bits from outside the I/O No. range
to go inside the I/O No. range
(2) Set number of bits from inside the I/O No. range
Y131 to go inside the I/O No. range
(3) Set number of bits from inside the I/O No. range
to be in excess of the I/O No. range
(4) Set area where there is no I/O layout.
(2)
(3)
(4)
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Chapter 6 Communication Mode
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