Siemens SIMATIC ET 200AL, System Manual

Page: 935 / 2255

Parameters/address space
4.3 Explanation of parameters
Digital I/O module F-DI 4+F-DQ 2x24VDC/2A, 4xM12 (6ES7146-5FF00-0BA0)
Equipment Manual, V1.0, 05/2021, A5E51082342-AA
29
V
Sn
V
S1
or V
S2
sensor supplies (V DC)
T_int Short-circuit test interval (time period) between the OFF pulses of the sensor supply (ms)
T_dur Short-circuit test OFF pulse time duration (ms)
Duration of short-circuit test
You can specify the duration of the test pulse applied to the sensor supply when the "Short-
circuit test" check box is selected.
This value is the time that the power supply remains off during the test. The short-circuit test
OFF pulse must be long enough for the external sensors and wiring to respond and present a
"0" to the inputs.
Sensor evaluation
You can assign whether “channel n” input operates individually (1oo1) or is paired with its
companion channel "n+2" input (1oo2).
Defines signal evaluation and wiring definitions. These selections correspond with the various
application mode wiring examples.
1oo1 evaluation: One sensor is connected to the module on a single channel.
1oo2 evaluation: Two input channels are occupied by either:
• 2 channel equivalent (with equivalent signals): One two-channel equivalent sensor or
two single-channel equivalent sensors are connected to the two channels, in a channel
pair.
• 2 channel - 3 wire nonequivalent : One two-channel nonequivalent sensor is connected
to the two channels, in a channel pair.
• 2 channel - 4 wire nonequivalent One two-channel nonequivalent sensor or two single-
channel nonequivalent sensors are connected to the two channels, in a channel pair.
If 1oo2 is selected, you must assign the discrepancy properties.
Refer to "Digital input applications (Page 39)" for illustrations of connection modes.