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

8.1.3 Structure of the Status Byte

The status bytes of "SEND" FB 200 and "RECEIVE" FB 201 are identical. The status byte gives

information on whether

• Receive data is available (bit 0 = 1)

• The Send mailbox is empty (bit 1 = 1)

If the Send mailbox is occupied, the Send job initiated by calling "SEND" FB 200 can not be

executed.

• Errors have occurred (bit 3 = 1)

If bit 3 is set, bits 4 to 7 contain the error code.

1 Receive data

available

0 No receive data

available

1 Permission to send

0 No permission to send

1 Bits 4 to 7 contain error

code

0 No errors

Status byte

SEND FB

Parameter error

RECEIVE FB

Parameter error

Target DB too

small for

Receive data

Error flagged in

the CBS

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

Figure 8-1. Structure of the "STAT" Status Byte

8-4

EWA 4NEB 811 6044-02a

1 2 ... 189 190 191 192 193 194 195 196 197 198 199 ... 256 257

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Siemens KS7 Series Spezifikationen Seite 194