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Basic Principles
PLC data
Programmability
Program memory
Data memory
Remanent flags
Runtime system
PLC cycle time
Programming languages
The diagnostic LEDs
Local errors
Blink code
BC2000
BC 2000
via
the
programming
or via optical fibre ring (TwinCAT)
32 kbytes / 96 kbytes
32 kbytes / 64 kbytes
512 bytes
1 PLC task
approx. 3 ms for 1000 instructions (including terminal bus I/O cycle)
IL, LD, FBD, SFC, ST
Preparing for Operation and Diagnostics
After switching on, the bus terminal controller immediately checks the
connected configuration. Error-free start-up is signalled by extinction of the
red LED "I/O ERR". If the "I/O ERR" LED blinks, an error in the area of the
terminals is indicated. The error code can be determined from the
frequency and number of blinks. This permits rapid rectification of the error.
There is a detailed description in the chapter on „The Diagnostic LEDs".
The bus terminal controller has two groups of LEDs for the display of
status. The upper group with four LEDs indicates the status of the
respective field bus. The significance of the "field bus status LEDs" is
explained in the next sections of this manual - it conforms to conventional
field bus displays.
On the upper right hand side of the bus terminal controllers are two more
green LEDs that indicate the supply voltage. The left hand LED indicates
the 24 V supply of the bus terminal controller. The right hand LED signals
the supply to the power contacts.
Two LEDs, the "I/O" LEDs, in the area below the field bus status LEDs
referred to above, serve to indicate the operating status of the bus
terminals and the connections to these terminals. The green LED lights up
in order to indicate fault-free operation. „Fault-free" means that the
communication with the fieldbus system is also running. The red LED
flashes to indicate an error. The red LED blinks with two different
frequencies. The error is encoded in the blinks as follows:
Fast blinking
First slow sequence
Second slow sequence
Start of the error code
interface
(TwinCAT
Start of the error code
Error type
Error location
Error type
BC/TwinCAT)
Error location
12
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