Siemens SIMATIC FM 353 Manual page 41

Input signal
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 353 interprets this input as
a Ready message from the power section.
An alternative connection option is available by way of peripherals connector X1
(see Section 4.4).
Its use is defined in machine data (see MD37, Section 5.3.1, 9.7.2).
Signal parameters of the input
Table 4-4 presents a summary of the electrical parameters of the input signal.
Table 4-4
1 Signal, voltage range
0 signal, voltage range
0 signal, input current
FM 353 Stepper Drive Positioning Module
6ES7 353-1AH01-8BG0
Electrical parameters of the "READY1_N" signal input
Parameters
V
H
V
L
I
L
Value Unit
3.5...5.5 V or input open
−1.5...2 V
−1.5...−3 mA
Wiring
Comment
4-9