Siemens SINUMERIK 802S - Page 28

Installing the Control System
2.3 Connecting the individual components
2-28
SINUMERIK 802S
6FC5 597–2AA00–0BP2 (01.02)
Signal level
RS422
Signal type
VO Voltage output (supply)
I 5V input (5V signal)
Encoder types which can be connected
Incremental 5 V encoders can be connected directly.
Characteristics
The encoders must meet the following requirements:
Transmission method: Differential transmission with 5 V square–wave
signals
Output signals: Track A as true and negated signal (U
a1
, U
a1
)
Track B as true and negated signal (U
a2
, U
a2
)
Zero signal N as true and negated signal
(U
a0
, U
a0
)
Max. output frequency: 1.5 MHz
Phase offset between
tracks A and B: 90° "30°
Current consumption: max. 300 mA
Cable lengths
The maximum cable length depends on the specification of the encoder supply and on the
transmission frequency. When using preassembled cables from SIEMENS, the following va-
lues may not be exceeded to ensure interference–free operation:
Table 2-9 Maximum cable length with respect to the encoder supply
Supply Voltage
Tolerance
Current
Consumption
Max.
Cable Length
5 V DC 4.75 V...5.25 V < 300 mA 25 m
5 V DC 4.75 V...5.25 V < 220 mA 35 m
Table 2-10 Maximum cable lengths with respect to the transmission frequency
Encoder Type
Frequency Max. Cable Length
1 MHz 10 m
Incremental
500 kHz 35 m