Components and Switch Settings
Section 2-1
17
2-1-3
Machine Number Switch
The CPU Unit and the Counter Unit exchange data via the Special I/O Unit Area
(CIO) and the Special I/O Unit DM Area. The Counter Unit is allocated 34 CIO
words and 90 DM words, starting at the addresses for this Machine number. The
Machine Number is set by using the two Machine Number rotary switches on the
front panel of the Unit.
As a result of this amount of allocated words, the subsequent 3 Machine Number
addresses cannot be used by other Special I/O Units, as their allocations would
overlap with this data.
Always turn OFF the power before setting the Machine Number. Use a flat-blade
screwdriver, being careful not to damage the switch. Be sure not to leave the
switch midway between settings.
ERH
Red
ON
CPU Unit has operational failure. (For a list of all the
errors that can occur at the CPU Unit see 5-1
)
OFF
CPU Unit has no operational failure.
CH1
Yellow
ON
Counter 1 is counting, i.e. the corresponding
counting gate is enabled and at least one pulse has
been detected.
OFF
Counter 1 is not counting, i.e. the corresponding
counting gate is closed or no pulses have been
detected.
CH2
Yellow
ON
Counter 2 is counting, i.e. the corresponding
counting gate is enabled and at least one pulse has
been detected.
OFF
Counter 2 is not counting, i.e. the corresponding
counting gate is closed or no pulses have been
detected.
CH3
Yellow
ON
Counter 3 is counting, i.e. the corresponding
counting gate is enabled and at least one pulse has
been detected.
OFF
Counter 3 is not counting, i.e. the corresponding
counting gate is closed or no pulses have been
detected.
CH4
Yellow
ON
Counter 4 is counting, i.e. the corresponding
counting gate is enabled and at least one pulse has
been detected.
OFF
Counter 4 is not counting, i.e. the corresponding
counting gate is closed or no pulses have been
detected.
LED
Colour
State Description
0
12
34
5
678
9
0
12
34
5
678
9
