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Auxiliary Area and CIO Area Allocations Section 4-3
CPU Bus Unit Area
CIO 1500 to CIO 1899
n = CIO 1500 + 25 × unit number
Status Area The Status Area is used for status information input from Serial Communica-
tions Board or Unit to the CPU Unit. The Status Area is where the Serial Com-
munications Board or Unit set communications status, the transmission
control signal status, and the transmission error status.
n = CIO 1500 + 25
× unit number
Unit No. Words
Unit No. 0 CIO 1500 to CIO 1524
Unit No. 1 CIO 1525 to CIO 1549
Unit No. 2 CIO 1550 to CIO 1574
Unit No. 3 CIO 1575 to CIO 1599
Unit No. 4 CIO 1600 to CIO 1624
Unit No. 5 CIO 1625 to CIO 1649
Unit No. 6 CIO 1650 to CIO 1674
Unit No. 7 CIO 1675 to CIO 1699
Unit No. 8 CIO 1700 to CIO 1724
Unit No. 9 CIO 1725 to CIO 1749
Unit No. A CIO 1750 to CIO 1774
Unit No. B CIO 1775 to CIO 1799
Unit No. C CIO 1800 to CIO 1824
Unit No. D CIO 1825 to CIO 1849
Unit No. E CIO 1850 to CIO 1874
Unit No. F CIO 1875 to CIO 1899
n + 1 to n + 4: Unit status
n + 5 to n + 8: Port 1 status
n + 15 to n + 18: Port 2 status
Words Bit Contents
Boards
(CS Series only)
Units
(CS/CJ Series)
Port 1 Port 2 Port 1 Port 2
CIO 1901 n + 1 02 to 15 Reserved
01 1: Error log EEPROM error 0: Error log EEPROM normal
00 1: Protocol data error 0: Protocol data normal
CIO 1902 n + 2 00 to 15 Reserved
CIO 1903 n + 3 00 to 15 Reserved
CIO 1904 n + 4 00 to 15 Reserved
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