Digital Input Support; Active Input And Output Support - Siemens TALON Series Technical Reference Manual

Digital Input Support

Active Input and Output Support

Siemens Industry, Inc.
588-587
NOTE:
Potential free (dry contact) for all points.
Digital input support includes:
Voltage free/dry contacts.

Pulse counters up to 25 Hz.

Digital Input Grounding Connections
The neutral of a digital input (on Digital Input, Universal and Super Universal modules)
can be connected to any neutral terminal on the same module. Several digital inputs
can also share a neutral terminal on the same module.
Technical Data
Digital inputs are not electrically separated from the system electronics.

Mechanical contacts must be volt-free.

Counter inputs faster than 1 Hz that are routed for more than 32.8 ft (10 m) in the

same trunking as analog inputs must be shielded.
Contact sensing voltage
Contact sensing current
Contact resistance with contacts closed
Insulation resistance with contacts open
Min. closing / opening
time [ms] including
bouncing
Maintained contact 60
Pulse contact 30
Mechanical Counter 20
CAUTION
Active inputs and outputs are permitted on the same module when connected
sensors are powered from that module. When sensors are externally powered,
active inputs and outputs should be on separate modules.
NOTE:
The neutral of analog inputs and outputs must always be connected to the
terminal associated with that I/O input.
Active input and output support includes analog input and output (0-10 Vdc).
CONFIDENTIAL: For internal use only
21.5 to 25 Vdc
1.0 mA (initial current 6 mA)
Max. 200Ω
Max. 50KΩ
Max. bounce time
[ms]
20
10
10
TALON TX-I/O Modules and Island Bus Technical Reference
TX-I/O Modules
Max. Counting
frequency
(symmetric)
25 Hz
21
4/6/2010