Siemens SIMATIC S5 CP 523 Manual page 211

CP 523
8.2 Using "RECEIVE" FB 201
"RECEIVE" FB 201 transfers message frames from the CP 523 to the CPU.
You must specify the following when calling "RECEIVE" FB 201:
• The start address of the CP 523
• The number of the target data block in which the message frame is to be stored on the CP 523
• The number of the target data word starting from which the message frame is to be stored
• A byte address where "RECEIVE" FB 201 can store the number of data words received
• A byte address where "RECEIVE" FB 201 is to store the status byte
• A byte address where "RECEIVE" FB 201 is to store the CBR (= KBE)
Receive enable is RLO = 1.
8.2.1 Calling and Setting "RECEIVE" FB 201 Parameters
"RECEIVE" FB 201 can be called in cyclic programs and in programs servicing timed interrupts
process interrupts .
*
: JU FB 201
NAME : RECEIVE
DES : BADR : KF
DES : Z-DB : B
DES : ZANF : KF
DES : ZLAE : MB
DES : STAT : MB
DES : KBE
Name Parameter
Type
BADR D
Z-DB B
ZANF D
ZLAE Q
STAT Q
KBE Q
Note:
The scan time may be exceeded if several message blocks are received.
Remedy: Program OB 31 "Set scan time" in FB 201 (address 00F0, network 6).
* Please note that FB 201 uses scratch flags.
EWA 4NEB 811 6044-02a
STL
Table 8-3. Block Parameters for "RECEIVE" FB 201
Data
Type
KF Initial address of the module
Number of the destination data block
KF Number of the 1st destination data word
BY Number of data words received (destination length)
BY Status byte
BY Coordination byte 'receive' (relevant only in 3964(R)
mode)
Using the "SEND" and "Receive" Function Blocks
LAD/CSF
FB 201
BADR
Z-DB
ZANF
Description
and
*
MB
ZLAE
STAT MB
KBE
FY
8-21