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Hardware interrupt low limit 2 Yes/No No Yes
• Hardware interrupt high limit 2 Yes/No No Yes
1) All parameters can be set for on a channel-specific basis
You can find an overview of the limits for the hardware interrupts in the section Structure of a
data record for input channels of the analog on-board I/O (Page 148)) All parameters can be set for on a channel-specific basis
2) Only for the "Current" output type
3) Only for the "Voltage" output typeThe diagnostics for short circuit to ground can be configured for the voltage output type.
Short-circuit detection is not possible for low output values. The output voltages must
therefore be under -0.1 V or over +0.1 V.
Wire break detection
The diagnostics for wire break can be configured for the current output type. Wire break
detection is not possible for low output values; the output currents must therefore be below -
0.2 mA or above +0.2 mAYou specify the properties of the digital on-board I/O during parameter assignment with
STEP 7 (TIA Portal). The tables below list the parameters that can be set for inputs and
outputs, respectively.
When parameters are assigned in the user program, they are transferred to the digital onboard
I/O via data records with the WRREC instruction, see section Parameter assignment
and structure of the parameter data records of the digital on-board I/O (Page 156).
The use of a digital input by a technology channel
When a digital input is in use by a technology channel (HSC, PTO or PWM) the
corresponding digital input channel remains fully usable without any restriction.
Use of a digital output by a technology channel
When a digital output is in use by a technology channel (HSC, PTO or PWM), the following
restrictions apply to the use of the corresponding digital output channel:
● Output values for the digital output channel are not effective. The output values are
specified by the technology channel.
● The CPU STOP behavior configured for the digital output channel is not effective. The
reaction of the output to CPU Stop is specified by the technology channel.
● With activated value status (Quality Information) for the DI16/DQ16 submodule, the QI bit
for the digital output channel shows the value 0 (= Status "Bad").
● The current state of the digital output is not returned to the process image output. In the
PTO operating mode, you can only observe the switching operations of the assigned
digital outputs directly at the output. In the PWM operating mode and with high-speed
counters (HSC), you can observe the current state additionally via the feedback interface.
Note, however, that high frequencies may no longer be observed under certain
circumstances due to an excessively low sampling rate.When the digital output is controlled by a technology
channel (HSC, PTO or PWM), this parameter is
not effective. In this case, the technology channel
specifies the reaction of the digital output to CPU
STOP.The CPU has three LEDs for displaying the current operating mode and diagnostics status.
The following table shows the meaning of the various combinations of colors for the