Project Design Limits For The El2912; Fig. 6 Delete Project Data - Beckhoff EL2912 Operating Instructions Manual

Product description
4.8 EL2912: using the integrated TwinSAFE Logic
functions
On delivery, the EL2912 behaves like a safe TwinSAFE I/O slave, which can be used as an alias device
within a TwinSAFE Logic, e.g. EL6910.
Alternatively, the local logic function of the EL2912 can be used. To this end please create a TwinSAFE
project in the Safety Editor and select the EL2912 as the target system. Further information on creating a
project can be found in the EL6910 documentation and the description of the function blocks under http://
www.beckhoff.de/english/download/twinsafe.htm.
In order to be able to use the EL2912 again as a safe TwinSAFE I/O slave, please delete the logic, the
mapping and the parameter data on the EtherCAT Terminal and switch the voltage off and on again.
Fig. 6: Delete project data
4.8.1

Project design limits for the EL2912

Project design limits
The maximum project design size of the EL2912 is limited by the available memory. This is
managed dynamically. The values specified in the following table are therefore only guide values
and may differ from the actual values, depending on the safety project.
Execution time of the logic function
Compared to the EL6910 with an identical logic program, the execution time will be typically longer as the
safe I/O signals have to be processed in addition. Accordingly this also affects the processing of the I/O
signals, as they can only be evaluated less frequently as the size of the project increases.
Process image size
TwinSAFE connections
Safe data per TwinSAFE
connection
TwinSAFE function blocks
TwinSAFE groups
TwinSAFE user
26
NOTE
max. 1486 bytes per data direction
(max. memory size 0x1E00 for 3 buffers, i.e. with identical input and
output process data sizes the maximum size is 1280 bytes per data
direction. Only even-numbered start addresses are possible, therefore
padding bytes may have to be included)
maximum 212
(up to 255 CRCs in total; 1 CRC is required for a TwinSAFE connection
with 1 or 2 byte safe data.)
maximum 126 bytes (telegram length 255 bytes)
maximum 512 (For using ESTOP function blocks with complete input and
output mapping. Other function blocks may lead to a lower maximum
number.)
maximum 128
maximum 40
Version: 2.0.0 EL2912 and EL2912-2200