FADAL MACHINING CENTERS
88 GENERAL INFORMATION MAN-0126_ R1
5.5 READING STATUS
GROUP
Reading a status in a computer can be very helpful for troubleshooting. Status is
usually a byte or a word. The status is normally represented in hexadecimal. To
demonstrate how a status byte is decoded, the command 1 byte in the diagnostics –
display switches will be used. Each binary bit in the status byte will represent one relay
in this case. Because Fadal uses negative logic, a value of zero (0) turns the relay on
(activates it). B0 is the right-most bit. Each Hexadecimal digit is representing four (4)
binary bits.
B0 = M68/M69
B1 = High range Idler
B2 = Unused
B3 = Drawbar / Geneva / Slide Enable
B4 = Drawbar
B5 = Air indexer
B6 = Coolant 1 On
B7 = Coolant 2 On
For example if the command 1 displayed “BD” then the binary equivalent would be “1 0
1 1 1 1 0 1”. To decode remember that “0” is On. In this example, B1 the high range
idler would be On and Coolant 1 would be On.
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