BECKHOFF BC2000 - Manual (Page 13)

Basic Principles
BC2000 12
PLC data BC 2000
Programmability via the programming interface (TwinCAT BC/TwinCAT)
or via optical fibre ring (TwinCAT)
Program memory 32 kbytes / 96 kbytes
Data memory 32 kbytes / 64 kbytes
Remanent flags 512 bytes
Runtime system 1 PLC task
PLC cycle time approx. 3 ms for 1000 instructions (including terminal bus I/O cycle)
Programming languages 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 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.
Local errors 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:
Blink code
Fast blinking Start of the error code
First slow sequence Error type
Second slow sequence Error location
Start of the error code Error type Error location