Siemens SIMATIC ET 200AL System Manual page 439

Parameters/address space
4.3 Address space
Configuration options of the digital input/digital output module DIQ 4+DQ 4x24VDC/0.5A 8xM8
You have the following configuration options:
• Configuration 1: without value status
• Configuration 2: with value status
Evaluating the value status
An additional two bytes are occupied in the input address space if you enable the value status
for the digital input/digital output module. The value status of the inputs is assigned to bits 0
to 3 in input byte x + 1. The value status of the outputs is assigned to bits 0 to 7 in input byte
x + 2. This additional information provides information regarding the validity of the digital
values or channel status.
Bit = 1: No error on channel.
Bit = 0: Error on channel.
If the channel is configured as input, this means:
• Short-circuit to ground at sensor supply or
• Parameter error
If the channel is configured as output, this means:
• Short-circuit of output to ground or
• Parameter error or
• For channels 4 ... 7: Missing load voltage 2L+
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Digital input/digital output module DIQ 4+DQ 4x24VDC/0.5A 8xM8 (6ES7143-5BF00-0BA0)
Equipment Manual, 08/2021, A5E32349882-AD