Siemens SIMATIC ET 200S - Page 358

Digital Electronic Modules
11-38
ET 200S Distributed I/O System
EWA-4NEB 780602402-12
Data for selecting an encoder
Input current for NAMUR
encoder
to NAMUR or EN
50227
• For signal ”1”
• For signal ”0”
2.1mAto7mA
0.35 mA to 1.2 mA
Input current for a switched
contact
• For signal ”1” 2.1mAto7mA
• for ”0” signal 0.35 mA to 1.2 mA
Input current for an
non-switched contact
• For signal ”1” Typical 8 mA
• permitted quiescent
current
0.5 mA
Input delay
• ”0” to ”1” transition Max. 4.6 ms
• ”1” to ”0” transition Max. 4.6 ms
Tolerated settling time for
changeover contacts
300 ms
Parallel wiring of inputs No
Sensor Power Supply Outputs
Number of outputs 1
Output voltage
• Loaded Min. 8.2 V
Output current
• Rated v alue 45 mA
Additional (redundant)
supply
Not permitted
Short-circuit protection Yes, electronic
Value status
The value status is additional binary information on a digital input signal. The value
status is input to the process image of the inputs at the same time as the signal
and supplied information on the validity of the input signal. The value status is
influenced by:
S Wire-break test / short circuit
S Flutter monitoring
S Pulse stretching
S Validity check of encoder type changeover contact
Significance of value status:
S ”1”: Input signal is valid
S ”0”: Input signal is invalid