Siemens SIMATIC S5 Manual page 217

S5-95U, SINEC L2
Emulation of Types of Data Transmission for the S5-95U on Layer 2 (Continued)
Type of Data
Transmission
ZP Master Send frame of ZP
master:
• SRD low
Response frame from
ZP slave:
• RESPONSE low
ZP Slave Response frame of ZP
slave:
• RESPONSE low
Receive frame from
ZP master:
• SRD low only
Layer 2 Services Send frame:
• SDA low/high
• SDN low/high
• SRD low/high
Receive frame:
• SDA low/high
• SDN low/high
• SRD low/high
Special Feature: If an S5-95U is in the STOP mode, receiving of a frame via the standard
connection (not broadcasting) and the PLC-to-PLC connection (local SAP=56
and 2 to 32) is acknowledged on layer 2 with "UE" (FDL/FMA 1/2-User Error) if
the connection was properly configured in the local S5-95U.
EWA 4NEB 812 6112-02
S5-95U Communications Matrix and Emulation of Transmission
L2 Frame Length of L2 Frame
(in Net Data)
Send frame of ZP
master:
• 0 to 242 bytes
Response frame of ZP
slave:
• 0 to 244 bytes
and RESPONSE permitted
high permitted
Response frame of ZP
slave:
• 0 to 242 bytes
Receive frame from
ZP master:
• 0 to 242 bytes
permitted permitted
Send frame:
• 0 to 242 bytes
Receive frame:
• 0 to 242 bytes
permitted
L2 SAPs (Default
SAP not Permitted)
When sending:
• Local SAP of ZP
master = 61
• Remote SAPs of
ZP slaves =
0 to 62
(configurable in
DB1)
When receiving: When receiving:
• Local SAP of ZP • All source addresses
slave = 61
• Remote SAPs of
ZP master = 0 to
62 permitted
When sending: When receiving:
• Local SAP = 33 to • All source addresses
54, 64 (default
SAP permitted)
• All remote SAPs
permitted
When receiving:
• Local SAP = 33 to
54, 64 (default
SAP permitted)
• All remote SAPs
permitted
Types on Layer 2
L2 Source
Addresses
-
permitted
permitted
F-3