BECKHOFF BC2000 - Manual (Page 22)

Settings in the TwinCAT System Manager
21 BC2000
registers of the bus terminal controller and the terminals.
PLC Runtime System
Port 800 The port number in the BC2000 for the PLC is fixed at 800.
Index Group Meaning
Index Offset
16#4020 Allocated flags area
%MB
0 .. 511
16#4021 Allocated bit flags area
%MX
0 .. 4095
16#4080 Cycle time and basic settings 0: minimum cycle time in 1/125
ms WORD
1: maximum cycle time in 1/125
ms WORD
2: current cycle time in 1/125 ms
WORD
3: mean cycle time in 1/125 ms
WORD
4: Number of PLC cycles after the
start DWORD
5: Nominal cycle time in ms
WORD
6: Background time in ms WORD
7: Length of the remanent flags
from %MB0 WORD
8: Start(1)/Stop(0) of the cycle
time measurement WORD
9: Time of the terminal bus cycle
WORD
0: Double Cycle
1: Before Cycle
2: After Cycle
16#F020 Input
%IB
0 .. 511
16#F021 Input bit
%IX
0 .. 4095
16#F030 Output
%QB
0 .. 511
Index Group / Index Offset
16#F031 Output bit
%QX
0 .. 4095
Example The variable in the flags area %MB10 is read directly by the PLC
programme in TwinCAT. The NetId of the target system is given for this
purpose. This number is found in the system manager, and is entered as a
string. The variable „Var1“ is declared as a 2 byte variable (INT or WORD).
As soon as Go_ADSREAD is switched to TRUE, the function block is
active, and the value contained in the BC2000 at %MB10 and %MB11 is
returned in „Var1“.