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37
Unit Functions
Section 3-2
Comparison with the
Registered Table
When DIP switch pin 1 (REGS) is ON and an I/O configuration table has been
registered in the Communication Unit, the actual I/O configuration is automat-
ically compared to the registered table when the power is turned ON. A verifi-
cation error will occur if a registered I/O Unit cannot join I/O communication or
an unregistered I/O Unit is detected.
In case of verification errors, the affected SmartSlice I/O Units will not partici-
pate in I/O communication. I/O communication will start with the other Smart-
Slice I/O Units.
■
Example of Comparison between Figure 1 and Figure 2
Note
1.
Register the I/O configuration table when all of the SmartSlice I/O Units are
communicating, i.e., when the PROFIBUS Communication Unit’s TS indi-
cator is lit green.
2.
A mismatch (verification error) with the registered table is indicated at the
PROFIBUS Communication Unit’s TS indicator (flashing red). The error
details can be retrieved using the GRT1-PRT DTM. Also, the error history
can be read with an explicit message command.
#1
#2
#3
#4
#1
#2
#3
#4
From left
Mismatch
I/O
Input
Input
Output
Output
Bits
4
4
4
2
Registered table
Actual configuration
From left
I/O
Input
Input
Output
Output
Bits
4
4
2
2
There are the same number of
Units, but the I/O data size does
not match, so a verification error
occurs and this I/O Unit does not
participate in communications.
#1
#2
#3
#4
Pin 1 ON when power
was turned ON.
Registration table
The actual configuration is compared to the registered table.
Units that do not match the registered table do not participate
in I/O communications. I/O communications start with the other
I/O Units.
Four
contact
inputs
Figure 2
Four
contact
inputs
Two
relay
outputs
Two
relay
outputs
PROFIBUS
Communications
Unit
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