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7
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ղ(HML+1) 0: Flag
It indicates the operation condition of the S-LINK system.
R/W Function
bit 7 R/W Confirmation of communication frame completion
(Output data communication completed with ‘0’ after writing in ‘1’)
bit 6 R/W System set (1: Read out condition of S-LINK I/O unit connection)
bit 5
㸫
Unusable (= 0)
bit 4 R S-LINK system communication status (1: Under communication)
bit 3 R ERROR 4 (1: Wire disconnection or abnormal I/O unit)
bit 2 R ERROR 3 (1: Abnormal voltage level between D and G)
bit 1
㸫
Unusable (= 0)
bit 0 R ERROR 1 (1: Short circuit between D and G)
(‘R/W’ ЍRead out / Write in, ‘R’ ЍRead out)
bit 0 to 3 : ‘ERROR 1, 3 and ERROR 4’ are ‘1’ when the respective error occurs.
bit 4 : It is ‘1’ when communicating with the S-LINK I/O units.
bit 6 : It has the same operation as ‘System set button’.
When ‘1’ is written, the connection condition of the S-LINK I/O units at that time is
read. It automatically returns to ‘0’ after the reading.
bit 7 : In case of sending different outputs to the same address, the former output data
will be ignored if the next output data is written in before the former output data
has been transmitted to the S-LINK output unit.
‘Confirmation of communication frame completion’ is used to confirm whether the
output data has been transmitted to the S-LINK output unit.
When writing in numbers other than ‘0’ after writing in output data, it automatically
returns to ‘0’ after transmitting the output data to the S-LINK output unit. So,
transmission error of output data will be prevented if you write in the next output
data after its returning to ‘0’ is confirmed by the program.
Notes: 1) ERROR 1, 3 are held on until the cause of the error is removed.
2) ERROR 4 can be released (‘0’) by supplying power either to the S-LINK system side or to the
personal computer PC/AT once again. Although release can also be obtained by pressing ‘System
set button’, in this case, refer to the note given in ‘3. FUNCTIONAL DESCRIPTION’.
ճ(HML+1) 1: Number of connected S-LINK I/O units / First address of units
where ERROR 4 occurs
Under normal condition: It indicates the number of connected S-LINK I/O units.
bit Assignment
7 to 0 Normal: Number of connected S-LINK I/O units 1 to 128
(In hexadecimal number system, 01H to 80H)
Note: When the same address is set for several S-LINK I/O units, they are regarded as one unit.
Under ERROR 4 condition: It indicates the first addresses of S-LINK I/O units where
ERROR 4 has occurred.
In case ERROR 4 occurs at several address, bit7 = ‘1’.
bit Assignment
7 1: ERROR 4 occurs at several units (in case the number of units with ERROR 4 = 1, bit = ‘0’)
6 to 0 Under ERROR 4 condition: First addresses of S-LINK units with ERROR 4 (0 to 127)
(In hexadecimal number system: 00H to 7FH)
Note: ‘First address of units with ERROR 4’ is held on. ERROR 4 can be released (‘0’) by supplying power
either to the S-LINK system side or to the personal computer PC/AT once again. Although release can
also be obtained by pressing ‘System set button’, in this case, refer to the note given in ‘3. FUNCTIONAL
DESCRIPTION’.
