Toshiba T2N - Manual (Page 143)

5.RAS Functions
130 PROSEC T2N
(2) Bit pattern check function
This function checks that the device ON/OFF status for a number of
devices are in the normal combinations (pattern). For example, checks
that not more than 2 from device 1, 2 and 3 are ON simultaneously.
When a maximum of 8 devices are registered up to a maximum of 16
patterns are possible. The check is carried out immediately before starting
a scan, the results are reflected in the special relay S0142.
In the pattern registration, OFF is shown as , ON is shown as
and do not care is shown as X.
The device and bit pattern registration takes place in programmer system
diagnosis mode.
device registered
(maximum 8)
bit pattern register
(maximum 16 patterns)
present device
status
X000 • • • • •
X003 • • • • •
X015 • • • • •
Y08A • • • • •
comparison
result
agrees with the register pattern ... S0142 = 0
does not agree with the register pattern ... S0142 = 1