Siemens 6ES7142-6BG00-0BB0, Equipment Manual, Page: 22 / 36

Parameters/address space
4.3 Address space
I/O device digital outputs DQ 8x24VDC/0.5A M12-L 8xM12 (6ES7142-6BG00-0BB0)
Equipment Manual, 07/2020, A5E46570894-AA
21
Value status (Quality Information, QI)
The value status is always returned with the following configuration options:
•
DQ 8x24VDC QI,
• DQ 8x24VDC MSO
Evaluating the value status
An additional byte is occupied in the input address space if you enable the value status for
the I/O device. Bits 0 to 7 in this byte are assigned to a channel and return information about
the validity of the digital output value.
Bit = 1: No error on channel.
Bit = 0: Error on channel.
Address space for configuration as 1 x 8-channel DQ 8x24VDC QI
The following figure shows the address space allocation for the configuration as 8-channel
I/O device digital outputs with value status.
Figure 4-2 Address space for configuration as 1 x 8-channel DQ 8x24VDC QI with value status
Address space for configuration as 1 x 8-channel DQ 8x24VDC MSO
With the configuration 1 x 8-channel I/O device (module-internal shared output, MSO), the
channels 0 to 7 (incl. value status) of the I/O device are copied into two submodules.
Channels 0 to 7 are then available with identical values in various submodules. These
submodules can be assigned to two IO controllers when the I/O device is used in a shared
device:
Outputs
• The IO controller to which submodule 1 is assigned has write access to outputs 0 to 7.
• The IO controller to which submodule 2 is assigned has read access to outputs 0 to 7.