10
Functions Section 1-2
Indicators
For details, refer to page 199, Troubleshooting via Indicators.
Checking the I/O Unit Interface Status
The first two words of the CPU Unit allocation input area are always allocated
to the status of the I/O Unit interface via the DeviceNet.
1-2-2 Exchanging Data
Initialization When the Communications Unit is started, it automatically recognizes the
configuration of the I/O Units and registers this status as the normal configu-
ration (in RAM memory). At the same time, addresses 0 to 7 are allocated to
the I/O Units in ascending order from the I/O Unit closest to the Communica-
tions Unit. These processes are performed each time the power is turned ON.
Unit Normal Error
Communications
Unit
TS Indicator:
Lit green
TS indicator
I/O Unit interface error: Lit red
Special I/O Unit error: Flashing green
Maximum power supply
overload to I/O Units: Not lit
I/O Units TS indicator:
Lit green
U.ERR indica-
tor: Not lit
PWR indicator:
Lit green
TS indicator
I/O Unit interface error: Lit red
U.ERR indicator
Special I/O Unit error: Lit red
PWR indicator
No internal power supply: Not lit
DeviceNet
Network
Communica-
tions Unit
I/O Unit I/O Unit
TS indicator
Output
area
Input
area
Status, two words
I/O Unit connection information
Error slaves Registered slaves
For details, see page 15.
DeviceNet Master Unit
DeviceNet Network
Communica-
tions Unit
I/O Unit I/O Unit
0 wd
+1 wd
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