Front of the PPU 27x.4
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① 3/8" threads for additional components ⑧ Proximity sensor
② Front cover ⑨ Numerical keys
③ QWERTY keyboard ⑩ Status LED: RDY, NC, CF
④, ⑦ Control keys ⑪ Slot for CompactFlash card
⑤ Keys to quickly select the operating area X125 USB interface
⑥ Cursor keypad X127 Ethernet interface (service connection)
System description
2.2 PPU versions
Software and hardware
Service Manual, 08/2018, 6FC5397-5DP40-6BA1 25