multiple submodules. The submodules can be assigned to different IO controllers when the
module is used in a shared device.
The number of usable IO controllers depends on the interface module used. Observe the
information in the manual for the particular interface module.
Contrary to the 1 x 8-channel module configuration, each of the eight submodules has a
freely assignable start address.The channels 0 to 7 of the module are copied in up to four submodules with configuration
1 x 8-channel module (Module-internal shared input, MSI). Channels 0 to 7 are then
available with identical input values in different submodules. These submodules can be
assigned to up to four IO controllers when the module is used in a shared device. Each IO
controller has read access to the same channels.
The number of usable IO controllers depends on the interface module used. Please observe
the information in the manual for the particular interface module.
Value status (Quality Information, QI)
The meaning of the value status depends on the submodule on which it occurs.
For the 1st submodule (= basic submodule), the value status 0 indicates that the value is
incorrect.
For the 2nd to 4th submodule (=MSI submodule), the value status 0 indicates that the value
is incorrect or the basic submodule has not yet been configured (not readyYou can find information on the Shared Input/Output (MSI/MSO) function in the section
Module-Internal Shared Input/Output (MSI/MSO) of the PROFINET with STEP 7 V13 The following figure shows the LED displays (status and error displays)
of AI 8xU/I/RTD/TC ST.Voltage missing or too low at backplane bus. • Switch on the CPU and/or the system power
supply modules.
• Verify that the U connectors are inserted.
• Check to see if too many modules are inserted.
Flashes Off
The module starts and flashes until the valid
parameter assignment is set.
---
On Off
Module is configured.
On Flashes
Indicates module errors (at least one error at
one channel, e.g., wire break).
Evaluate the diagnostics data and eliminate the
error (e.g., wire break).
Flashes Flashes
Hardware defective. Replace the moduleSupply voltage L+ to module too low or missing Check supply voltage L+.
On
Supply voltage L+ is present and OKChannel disabled ---
On
Channel configured and OK. ---
On
Channel is configured (channel error pending).
Diagnostic alarm: e.g. wire break
Check the wiring.
Disable diagnosticsAnalog input module AI 8xU/I/RTD/TC ST supports the following diagnostic and hardware
interrupts.
You can find detailed information on the event in the error organization block with the
"RALRM" instruction (read additional interrupt info) and in the STEP 7 online help.
Diagnostic interrupt
The module generates a diagnostic interrupt at the following events:
● Missing supply voltage L+
● Wire break
● Overflow
● Underflow
● Common mode error
● Reference channel error
● Parameter assignment error
Hardware interrupt
The module generates a hardware interrupt at the following events:
● Low limit violated 1
● High limit violated 1
● Low limit violated 2
● Above high limit 2
The module channel that triggered the hardware interrupt is entered in the start information