Operation
EP1957-0022 and EP1957-2222 33Version: 2.0.0
Fig.18: EP1957 - Delete project data
5.3.3.1 Project design limits of EP1957
Project design limits
The maximum project design size for EP1957 is determined 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.
NOTE
Execution time of the logic function
The execution time of the logic program - with identical logic program - will typically be longer compared to
the EL6910, since the safe I/O signals must be processed additionally. This also has a corresponding effect
on the processing of the I/O signals, since with increasing project size these can only be evaluated with a
lower frequency.
Process image size max. 1486byte per data direction
(Maximum memory size 0x1E00 for 3 buffers, ie with the same size
of input and output process data, a maximum size of 1280 bytes
per data direction is possible. Only straight start addresses are
possible, so fill bytes must be taken into account.)
TwinSAFE connections 128 max. (up to 255 CRCs in total; 1 CRC is required for a
TwinSAFE connection with 1 or 2 byte safe data.)
Safe data per TwinSAFE connection maximum 126byte (telegram length 255byte)
TwinSAFE blocks maximum 512 (For using ESTOP function blocks with complete
input and output mapping. Other function blocks can lead to a
smaller maximum number.)
TwinSAFE groups 128 max.
TwinSAFE user 40 max.
Standard PLC inputs dynamic (memory-dependent), max. 1483byte
Standard PLC outputs dynamic (memory-dependent), max. 1483byte
NOTE
Project development
TwinCAT 3.1 Build 4022.25 or newer is required to use the internal logic functions. If the EP1957 is used as
TwinSAFE slave with the default project, at least an EL6910, EK1960 or newer logic component is required
as TwinSAFE master.
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