Characteristics Of The Communications Mechanisms - Siemens SIMATIC S5 Series Manual

Description of the System
The following overview (
mechanisms supported by the SI2 interface.
Table 1-2 Characteristics of the Communications Mechanisms
Communications
Mechanism
Programmer
Functions
SINEC L1 / Point-
to-Point Link
3964(R) Computer
Link
ASCII Driver
1-4
Table 1-2) contains the main characteristics of all communications
• PLC is programmed with programmer or process functions in the
PLC are monitored with operator panel
• Programmer functions are especially suitable for startup of PLCs
and input and output of messages
• An operator panel can be permanently connected to Si1 or SI2, a
serial interface remains free for a programmer.
• The S5-95U can access the SINEC L1 LAN via SI1 or SI2.
• Point-to-point link making use of the SINEC L1 protocol is possible
(1 S5-95U+1 communication partner),
for this purpose, no CP 530 is necessary.
• Safe process data transmission
• Data volume per request: 64 bytes
• Bidirectional data communication with protocol protection
mechanism (in two directions)
• The LAN must be able to process the 3964(R) protocol
• Safe process data transmission
• Data volume per request: Maximum of 1024 bytes
• Bidirectional data communication without protocol-dependent error
detection and correction functions
• Flexible transmission format can be set, resulting in easy adaptation
to the LAN
• The ASCII driver is especially suitable for visualization of process
sequences and input/output of messages
• Data volume per request: Maximum of 1024 bytes
S5-95U, Second Serial Interface
Features
EWA 4NEB 812 6095-02