Siemens SINUMERIK 840Di - Page 100

06.03
2.12 I/O Module PP72/48
2-100
 Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition
S Electrical specification of the digital outputs:
Table 2-21 Electrical specification of the digital outputs
Digital outputs
min. typical max. nominal
Voltage at high level (V
hi)
V
CC
– 3V
1)
V
CC
24V
Output current I
OUT
– – 500mA –
Voltage at low level (V
lo)
– – – Output
open
Leakage current at low level – 50mA 400mA –
Signal delay time T
PHL
2)
– 0.5msec – –
Max. switching frequency
2)
Ohmic load 100Hz – – –
Inductive load 2Hz – – –
Lamp 11Hz – – –
S Power supply of the digital outputs
1) typical output voltage: V
CC
– I
OUT
<R
ON
V
CC
: Current operating voltage
Max. output current I
OUT
: 250mA for a simultaneity factor of 100%
500mA for a simultaneity factor of 50%
Max. short-circuit current: 4A (max. 100msec, V
CC
= 24V)
Internal resistance R
ON
: 0.4W
S 2)
Moreover, the PROFIBUS communication time and the application cycle time must
be taken into account.
S Incorrect polarization causes neither high level nor destruction of the outputs.
S General electrical properties
– Galvanic isolation using optocouplers
– Current limitation to max. 500mA
– Protection from: short-circuit, overtemperature, and loss of ground
– Autom. shutdown on undervoltage.
2 Hardware Descri
p
tions