S5-95U, SINEC L2 System Description
Table 1-7 lists the characteristics of the various types of data transmission to help you select the
best type for your specific application.
Table 1-7. Characteristics of the Various Types of Data Transmission
* Since no job is requested by the user in the case of implicit communications
explicit
implicit
Characteristics Standard
Connection
PLC-to-PLC
Connection
Cyclic I/O (ZP) Layer 2 Access
Com-
muni-
ca-
tions
Via send and
receive
mailboxes
Via L2-SEND FB
and L2 RECEIVE
FB
Via L2-SEND FB
and L2-RECEIVE
FB
Automatic, without
being initiated by
the user program
Amount of
data
1 to 242 bytes
per job
1 to 242 bytes per
job
ZP master:
Input range
0 to 128 DW
Output range
0 to 128 DW
ZP slave:
Input range
0 to 121 DW
Output range
0 to 121 DW
0 to 242 bytes per
job
Send and
receive data
may be
located
In the flag area or
in the data area
In the flag area or
in the data area
In the data area
In the flag area or
in the data area
Parallel
processing of
several send
and receive
jobs
No Yes;
one send job and
one receive job in
parallel per
communications
partner
Non-applicable* Yes;
23 random jobs in
parallel
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EWA 4NEB 812 6112-02
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