Siemens SIMATIC S5 CP 523 Manual page 200

Using the "SEND" and "Receive" Function Blocks
8.1.6 Flags in "SEND" FB 200
Explanation of the flags used by "SEND" FB:
Flags
F 255.0
F 254.0
F 237.0
FY 238.0
FY 254
FW 238
FW 240
FW 242
FW 244
FW 246
FW 248
FW 250
FW 252
FW 254
8-10
Symbol
Auxiliary flag for buffering the
H-FLAG-1
RLO at jump
H-FLAG-2 Auxiliary flag for STAT bit "SEND executing"
Auxiliary flag for detecting end-of-text
H-FLAG-3
characters
H-BYTE-2 Auxiliary flag byte for buffering CBS
H-BYTE-1 Auxiliary flag byte for buffering STAT
Auxiliary flag word for buffering the data words
HILFREG
to be transferred
B-AN-S "Number of send frames" register
Module address register (DO FW register for CP
BADR-REG
access)
QANF register (auxiliary register data word block
QANF-REG
pointer for Q-DW-IND)
Q data word index register (DO FW register for
Q-DW-IND
fetching data words from the Q-DB)
Frame remainder register (number of data words
B-REST-R
in the last message block)
Byte 1 index register (CP byte address register for
BYTE1IND
data transfer between CPU and CP, DO FW
register)
Byte 2 index register (CP byte address register for
BYTE2IND
data transfer between CPU and CP, DO FW
register)
HILFSREG Auxiliary flag word for calculating Q-DB lengths
Meaning
EWA 4NEB 811 6044-02a
CP 523