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It indicates the operating condition of the S-LINK system.
bit
R/W
7
R/W
6
R/W
-
5
4
R
3
R
2
R
1
-
0
R
bit 0, 2, 3 : "ER1, ER3 and ER4" are "1" when the respective error occurs.
bit 4
: It is "1" when communicating with the S-LINK units.
bit 6
: It has the same operation as "4) System set button" of "3. Functional Description."
When "1" is written, the connection condition of the S-LINK units at that time is read.
(It becomes "0" after the completion of 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.
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put data has been transmitted to the S-LINK output unit.
When "1" is written after writing in output data, it automatically becomes "0" after trans-
mitting 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
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2) ER4 is held on. It can be released ("0") by switching on again either the S-LINK system side
power supply (+24V DC) or the PC/104 bus side power supply (computer power supply) after fault
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[Under normal condition] It indicates the number of connected S-LINK units.
bit
7 to 0
Note: When the same address is set for several S-LINK units, they are regarded as one unit.
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bit
7
6 to 0
Note: "First address of S-LINK units with ER4" is held on. ER4 can be released ("0") by switching on
again either tthe S-LINK system side power supply (+24V DC) or the PC/104 bus side power supply
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7
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(Output data communication completed with "0" after writing in "1" )
System set (1: Read condition of S-LINK unit connection)
Condition of S-LINK system communication (1: Communicating)
ER4 (1: Wire disconnection or abnormal I/O unit)
ER3 (1: Abnormal voltage level between D and G)
ER1 (1: Short-circuit between D and G)
Under normal operation: Number of connected S-LINK units 0 to 128
(In case of hexadecimal number system, 00H to 80H)
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1: ER4 occurs at several units ("0" in case the number of units with ER4 = 1)
Under ER4 condition: First address of S-LINK units with ER4 (0 to 127)
(In case of hexadecimal number system, 00H to 7FH)
Assignment
Unusable (= 0)
Unusable (= 0)
("R/W": Read out / Write in, "R": Read out)
Assignment
Assignment
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