TX-I/O Modules
Digital Input Support
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 21.5 to 25 Vdc
Contact sensing current 1.0 mA (initial current 6 mA)
Contact resistance with contacts closed Max. 200Ω
Insulation resistance with contacts open Max. 50KΩ
Min. closing / opening
time [ms] including
bouncing
Max. bounce time
[ms]
Max. Counting
frequency
(symmetric)
Maintained contact 60 20
Pulse contact 30 10
Mechanical Counter 20 10 25 Hz
Active Input and Output Support
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).
21
Siemens Industry, Inc. TALON TX-I/O Modules and Island Bus Technical Reference
588-587 CONFIDENTIAL: For internal use only 4/6/2010
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