01/2007
2.10 Uninterruptible power supply (UPS)
2-77
© Siemens AG 2007 All Rights Reserved
SINUMERIK 840Di sl Manual (HBIsl) – 01/2007 Edition
– Exhaustive discharge protection
– Accu test
S Signaling of current status via LED
– Normal operation
– >85 % full charge
– Battery standby supply
– Buffer standby not available (alarm)
S Additional output of all signals via a PC–capable interface:
– Type ....–2EC31: Serial Interface
– Type ....–2EC41: USB interface
The USB interface corresponds to specification 2.0. Communication is however
only performed at ”full speed” corr. to 12 Mbaud. A commercial type four–core
shielded USB cable with a maximum cable length of 3 m can be used.
Table 2-12 Signal assignment of USB connector
Pin
Signal Designation
1 VBUS Power supply
2 D– Transmitted data
3 D+ Transmitted data
4 GRD Ground
USB interface
2 Hardware Descri
tions
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