Siemens SIMATIC Equipment Manual page 21

Parameters/address space
4.3 Address space
Value status (Quality Information, QI)
The value status is always returned with the following configuration options:
• DI 16x24VDC QI,
• DI 16x24VDC MSI
Evaluating the value status
An additional two bytes are occupied in the input address space if you enable the value status
for the I/O device. Bits 0 to 7 in these bytes are assigned to a channel and return information
about the validity of the digital input value.
Bit = 1: No error on channel.
Bit = 0: Error on channel.
Note
Value status with diagnostics
With pending diagnostics, the value status of the affected channel is always 0.
Exception: If you disable the wire-break check and wire-break diagnostics parameter, the
value status is not affected by a wire break.
Address space for configuration as 1 x 16-channel DI 16x24VDC QI
The following figure shows the address space allocation for the configuration as 16-channel
I/O device digital inputs with value status. You can freely assign the start address for the I/O
device. The addresses of the channels are derived from the start address.
Figure 4-2
20
Address space for configuration as 1 x 16-channel DI 16x24VDC QI with value status
I/O device digital inputs DI 16x24VDC M12-L 8xM12 (6ES7141-6BH00-0BB0)
Equipment Manual, 06/2021, A5E46570510-AB