
Chapter 2 Specification of Communication port for CPU module
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(4) Error flag [4] and Error code [5]
The system will turn on the error flag [4] and store the error code [5] if factors of the error are found in the system.
User must clear this flag and area if necessary because the system does not clear them.
[4]
Detection of error
: Operation by user
: Operation by system
Turn OFF the flag by user if necessary.
(System does not turn OFF the flag.)
[B]
Error code set
[5]
Error code reset
Clear the code by user if necessary.
(System does not clear the code.)
Figure 2.16 Error flag and Error code
(5) Transmitting counter and Receiving counter
The increment of the transmitting counter is performed when message data is transmitted.
The increment of the receiving counter is performed when message data is received.
User must clear the transmitting counter and the receiving counter if necessary because the system does not clear
them.
: Event
Increment
Transmitting
counter
Increment
Clear the counter by user if necessary.
(System does not clear the counter.)
Transmitting of message data Transmitting of message data
Increment
Receiving
counte
Increment
Clear the counter by user if necessary.
(System does not clear the counter.)
Receiving of message data Receiving of message data
Figure 2.17 Transmitting counter and Receiving counter
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