Siemens SIMATIC S5 Manual page 213

Technical Specifications; Cycle Delay Times
Type of Prerequisites
Data Trans-
mission
Standard Sending and/or
connection receiving is
enabled
PLC-to-PLC When sending:
connection/ Send job is
layer 2 possible
services
When receiving:
Receive data
are available
Cyclic I/O is
Cyclic I/O
defined
Programmer functions:
Programmer functions vary considerably regarding their influence on the cycle delay time and
therefore no generally valid times can be specified.
E-4
Amount of When PLC Scan
Data Cycle Loaded
1 to When sending:
242 bytes The PLC scan
cycle is loaded
when the send job
is registered by the
operating system
(this takes place
within 10 ms)
When receiving:
The PLC scan
cycle is loaded
when receive data
has arrived at
receive mailbox.
1 to 242 Every time an L2-
bytes FB is invoked
(PLC/PLC)/ (FB252, FB253)
0 to 242
bytes
(layer 2)
ZP master: 1 When transferring
to 128 words the ZP data at the
ZPA and/or 1 ZP cycle
to 128 words checkpoint (prior to
ZPE the OB1 cycle)
ZP slave:
1 to 121
words ZPA
and/or 1 to
121 words
ZPE
S5-95U, SINEC L2
PLC Cycle Delay Time
as Sender or Receiver
Worst case for 1 byte:
550 µs
Worst case for
242 bytes:
650 µs
When assigning
parameters direct to the
L2-FBs:
worst case for 1 byte:
500 µs
worst case for 242 bytes:
600 µs
When assigning
parameters indirectly to
the L2-FBs:
worst case for 1 byte:
550 µs
worst case for 242 bytes:
650 µs
Worst case for 1 word
ZPA and 1 word ZPE:
400 µs
Worst case for 128 words
ZPA and 128 words ZPE:
600 µs
EWA 4NEB 812 6112-02