Checking The Keys - HEIDENHAIN iTNC 530 Service Manual

23.4 Checking the Keys

Correct
operation?
Visual inspection
The key may thus get stuck.
In such events carefully clean the machine operating panel. --> See "Corrective Action" on page
23 – 398.
This is an indication that the service life of the tool has expired and that it does not make contact
any longer.
The keys and buttons of the MB are assigned to PLC inputs:
Does the control
receive the key
Assignment of the PLC inputs to the keys of the MB 420:
signal?
Two further inputs (I151 and I152) may be wired via terminal block X3:
Terminal X3
1
2
3
Here, for example, the CONTROL ON button is interrogated. --> See circuit diagram of the
machine.
Assignment of the PLC inputs to the keys of the MB 520:
The machine manufacturer can assign the keys marked with "free" to any PLC input. --> See
circuit diagrams of the machine.
23 – 392
Make sure that the key really functions in the selected operating mode. --> Consult the
machine operator or see user's manual!
First check the keypad visually!
Is the key heavily contaminated (grease, dust, oil, etc.)?
Are there any jammed chips?
Is the key or the area around it heavily worn out?
I I
I I
136 135 134 137
I I I I
128 148 133 149
I I I I
129 130 131
132
Pin layout
I151
I152
+24 V
I I I
138 143 145
I I I
139 150
144
I
I I
140 141 142
HEIDENHAIN Service Manual iTNC 530
I
146
I
147