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CP 523 Using the ”SEND” and ”Receive” Function Blocks

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* and

process interrupts

FB 201

: JU FB 201

NAME : RECEIVE

DES : BADR : KF

DES : Z-DB : B

DES : ZANF : KF

DES : ZLAE : MB

DES : STAT : MB

DES : KBE

STL LAD/CSF

BADR

Z-DB

ZANF ZLAE

STAT

KBE

Table 8-3. Block Parameters for "RECEIVE" FB 201

Name Parameter Data Description

Type Type

BADR D KF Initial address of the module

Z-DB B Number of the destination data block

ZANF D KF Number of the 1st destination data word

ZLAE Q BY Number of data words received (destination length)

STAT Q BY Status byte

KBE Q BY Coordination byte 'receive' (relevant only in 3964(R)

mode)

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

8-21

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