Siemens SIMATIC FM 453, Manual

Page: 41 / 380

4-9
FM 453 Servo Drive / Step Drive Positioning Module
C79000-G7076-C453-01
Signal parameters of the outputs
All output signals are output by way of differential-signal line drivers in com-
pliance with Standard RS422
. To ensure optimum noise immunity, the power section should feature differ-
ential signal receivers or optical coupler inputs to permit balanced signal
transfer. Unbalanced transfer is also possible, however cable length in such
cases is limited to a maximum of 10 m.
Table 4-5 Electrical Parameters of the Step Drive Signal Outputs
Parameters Min Max Unit when
Differential output voltage V
OD
2 V
RL = 100
Ω
Output voltage “High” V
OH
3.7 V I
O
= -30 mA
Output voltage “High” V
OH
4.5 V I
O
= -100
µ
A
Output voltage “Low” V
OL
1.1 V I
O
= 30 mA
Load resistance R
L
55
Ω
Output current I
O
60 mA
Pulse frequency f
p
1 MHz
Connecting cable
Permissible length ( l ):
for balanced transfer, 35 m
for unbalanced transfer, 10 m
READY1_N
This input is non-isolated and works with a 5V level. A floating output
(switching contact or optical coupler) may be connected. The FM 453 inter-
prets this input as a Ready message from the power section.
An alternative connection option is available via the front connector X1
(READY2 see Section 4.6). For example, in incremental mode, channels 1 to
3 with cable 6FX2 002-3AB04-1
VVV
.
The use of READY1_N and READY2 is parameterized in accordance with
the system configuration in the machine data (see
MD37, Section 5.3.1).
Signal parameters of the input
Table 4-6 Electrical Parameters of the “READY1_N” Signal Input
Parameters Value Unit Notes
1 Signal, voltage range V
H
3.5 ... 5.5 V or input open
0 signal, voltage range V
L
-1.5 ... -1 V
0 signal, input current I
L
-1.5 ... -3 mA
Input Signal
Wiring the FM 453