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24: R
EMOTE
I/O S
YSTEM
24-10
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ONTROLLER
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ANUAL
Special Data Registers for INTERBUS Master Information
Six data registers are assigned to store the system error and status information.
Allocation No.
Description
Remarks
D8178
INTERBUS Master System Error Information
Occurred process
0
Normal
Initialization process
or recovering process
from Bus NG
1
INTERBUS master DPRAM is Not Ready (DPRAM fault, etc.)
2
INTERBUS master is Not Ready (master unit fault, etc.)
3
No response from INTERBUS master (timeout error)
4
System error (unexpected reply from INTERBUS master)
5
Entr y count error (disparity of quantity of nodes between actual
system setup and Function Area Settings value)
6
Data size error (bus station of invalid size is connected)
7
ID code error (bus station of invalid type is connected)
8
Maximum node quantity over (more than 32 nodes are connected)
D8179
INTERBUS Master Status Transition Number
0
Power ON
1
DPRAM and master ready (ready for receiving ser vice command)
2
Reading and identification of configuration complete
3
I/O logical addressing complete
4
Set the bus active
5
Set the bus to run (I/O data updated)
5 is stored during
normal operation
6
Bus NG occurred
D8180
****h
INTERBUS Master Acknowledge Code
Stores execution result of remote I/O master command request.
0 (normal completion)
or error code is stored
D8181
****h
INTERBUS Master Additional Error Information
Stores additional error information of D8180
D8182
****h
INTERBUS Master Error Code
D8183
****h
INTERBUS Master Error Location
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