Siemens SIMATIC S5 Manual page 216

S5-95U Communications Matrix and Emulation of Transmission
Types on Layer 2
Emulation of Types of Data Transmission for the S5-95U on Layer 2
Type of Data
Transmission
Standard Send frame:
Connection • SDA low
• SDN low for
Receive frame, active
stations:
• SDA low,
• SDA high,
• SDN low and SDN
Receive frame,
passive stations:
• Only SDN low
PLC-PLC Send frame:
Connection • SDA low
Receive frame:
• Only SDA low
F-2
L2 Frame Length of L2 Frame
(in Net Data)
Send frame:
• 1 to 242 bytes
broadcasting Receive frame:
• 1 to 242 bytes
permitted
high permitted
permitted
Send frame:
• 1 to 242 bytes
Receive frame:
• 1 to 242 bytes
permitted
permitted
S5-95U, SINEC L2
L2 SAPs (Default
SAP not Permitted)
When sending: When receiving:
• Local SAP = 56 • All source addresses
• Remote SAP = 56
When receiving:
• Local SAP = 56
• Remote SAPs, only
56 permitted
When sending: When receiving:
• Local SAP = de- • Only source address
stination address
+ 1
• Remote SAP =
local address + 1
When receiving:
• Local SAP =
source address
+ 1
• All remote SAPs
permitted
EWA 4NEB 812 6112-02
L2 Source
Addresses
permitted
= local SAP - 1
permitted