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3-2
Section
Functions
31
Indicators
Unit
Normal
Error
Communication
Unit
TS Indicator:
green ON
TS indicator
I/O Unit interface error:
red ON
Special I/O Unit error:
green BLINKING
Maximum power supply
overload to I/O Units:
OFF
I/O Units
TS indicator:
green ON
U.ERR
indicator: OFF
PWR indicator:
green ON
TS indicator
I/O Unit interface error:
red ON
U.ERR indicator
Special I/O Unit error:
red ON
PWR indicator
No internal power supply: OFF
For details, refer to page 161,
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 received via PROFIBUS-DP.
Status, two words
I/O Unit connection information
Error slaves
Registered slaves
For details, see section 3-2-4
I/O Unit Interface Status.
3-2-2 Exchanging Data
When the Communication Unit is started, it automatically recognizes the
configuration of the I/O Units and registers this status as the normal
configuration (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
Communication Unit. This I/O table is compared with the PROFIBUS-DP
Chk-cfg message. These processes are performed each time the power is
turned ON.
Note
1. If the configuration of the I/O Units is to be changed, a number of precautions
must be noted. For details, see
3-2-5 I/O Configuration Changes
.
2. For details of data exchange timing, see
8-1-1 I/O Response Time
.
Initialization