Siemens SINUMERIK 840D sl Equipment Manual page 22

Description
Function blocks
In the unit:
• PCB with CPU, memory
• Ethernet controller
Device front:
• LC display as touch screen
– 640 x 480 (VGA) Color TFT
– Inverter on board
• 52-key membrane keyboard
– 24 machine control keys
– 28 control keys (number pad, cursor pad, function keys)
• Emergency stop button, 2-channel
• Rotary override switch (19 positions)
• Handwheel (optional)
Device rear:
• 2 enabling buttons (2-channel, 3-stage)
• Serial interfaces:
– HT 8 connection cable to terminal box / connection module
– USB interface (with dummy plugs)
• Power supply (+24 V)
22
Handheld Terminal HT 8
Equipment Manual, 02/2024, A5E52918633B AA