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24: REMOTE I/O SYSTEM
Special Data Registers for INTERBUS Master Information
Six data registers are assigned to store the system error and status information.
Allocation No.
Description
INTERBUS Master System Error Information
D8178
0
Normal
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
Entry 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)
Remarks
Occurred process
Initialization process
or recovering process
from Bus NG
INTERBUS Master Status Transition Number
D8179
24-10
0
Power ON
1
DPRAM and master ready (ready for receiving service 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)
6
Bus NG occurred
5 is stored during
normal operation
D8180
****h
INTERBUS Master Acknowledge Code
Stores execution result of remote I/O master command request.
D8181
****h
INTERBUS Master Additional Error Information
Stores additional error information of D8180
D8182
****h
INTERBUS Master Error Code
See page 24-16
D8183
****h
INTERBUS Master Error Location
See page 24-16
OPENNET CONTROLLER USER’S MANUAL
0 (normal completion)
or error code is stored