Siemens sinumerik 828d Service Manual page 103

Removing
Figure 4-15
NOTICE
Electro-static discharge (ESD)
Before you touch the module, discharge yourself at the cabinet or at the ground terminal.
Procedure:
1. Switch-off the control: Completely switch off the system. Check that the system is in a no-
2. Access the control cabinet where the module is located.
3. Using a multimeter, check the X1 power supply to ensure that the system really is in a no-
4. If it has not already been done, label all connectors that lead to the module now. Only
5. Withdraw the power supply X1.
6. Release the connectors of the ribbon cables (X111, X222, X333) on the module that are
Hardware and Software
Service Manual, 03/2011, 6FC5397-5DP40-0BA0
Rear of the PP 72/48D PN
voltage condition and is locked-out so that it cannot be switched on again without the
appropriate authorization.
voltage condition.
then, can it be ensured that the cables are not interchanged.
used to connect the digital inputs and outputs.
Service cases - hardware
4.5 I/O modules
103