Siemens SIMATIC S5 Series, Manual

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S5-95U, Second Serial Interface Computer Link with 3964(R) Transmission Protocol
DB1 parameters for the computer link
You specify the following in DB1:
•
Position of the parameter set for the computer link
• Positions of send mailbox, receive mailbox,
”
send
”
and
”
receive
”
coordination bytes
• Mode number
• Parameter set for computer link.
Table 3-3 Computer Link, DB1 Parameters
1
The ”PAR” parameter must precede the parameter set for the computer link in the ”RKT:” parameter block.
2
Specify in 10 ms steps.
Computer Link with Second Interface
Parameter Argument
Permissible
Range
Block Identifier: RKT:
PAR
1
SF
EF
KBS
KBE
MOD
BDR
PRTY
DF
DT
PRI
TIO
BWT
TTE
TTS
DBxDWy
or
MBz
n
m
p
q
s
2
r
t
2
u
2
v
w
Meaning
Position of PARameter set
Position of send mailbox (beginning)
Position of receive mailbox (beginning)
Position of
”
send
”
coordination byte
Position of
”
receive
”
coordination byte
”
MODe number
”
Parameter set for computer link:
”
BauD Rate
”
transmission rate in bit/s
”
PaRiTY
”
”
Data Format
”
”
Delay Time
”
Character delay time in ms
”
PRIority
”
”
TIme Out
”
in ms
”
Block Wait Time
”
Block waiting period in
ms
”
Tries To Errect
”
Number of buildup
x= 2 ... 255
y= 0 ... 255
z= 0 ... 255
n= 1, 2
m= 200; 300; 600;
1200; 2400;
4800;9600
p= E(
VEN
); O(
DD
);
M(
ARK
);
S(
PACE
); N(
ONE
)
q= 0 ... 5, 7, 8
s= 10 ... 655330
r= H(
IGH
); L(
OW
)
t= 20 ... 655340
u= 30 ... 655350
v= 1 ... 255
w= 1 ..
.
255
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The parameter settings in the S5-95U and the other communication partner must be identical except
for the parameter
”
PRI
”
(priority). Opposite priorities must be set in the communication partner and
the S5-95U to avoid initialization conflicts ( Section 3.6).
Note: If you have specified a DB after the
”
PAR
”
parameter in DB1, you have to generate this DB
before switching the PLC from STOP to RUN.
EWA 4NEB 812 6095-02
3-11