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S5-115U Manual
Table 12-14. Parameter Block for a Communications Link
System Data
Word
SD 48
SD 49
Data word number
SD 50
Flag byte or DB number
SD 51
SD 52
Data word number
SD 53
Flag byte or DB number
SD 54
SD 55
Data word number
1 4D
(KH) or "M" (KS) for the flag area, 44
H
2 Flag byte number 0 to 255 or data block number 2 to 255
3 Only when the parameter set is located in a data block, otherwise irrelevant
12.5.2 Assigning a Mode Number (System Data Word 55, EA6E
Data can be transmitted in one of two modes. The mode selected, that is to say, its code number,
must be entered in the low-order byte of system data word 55 (also see Table 12-14).
Refer to Table 12-15 for detailed information regarding the mode.
Mode
1
No block check character (BCC) is transmitted at the end of a frame (3964)
2
A block check character (BCC) is transmitted at the end of each frame (3964R)
EWA 4NEB 811 6130-02b
High-Order Byte
Parameter set
1
Data identifier
Parameter set
3
Send mailbox
2
Receive mailbox
1
Data identifier
Receive mailbox
3
CBS
2
CBR
1
Data identifier
CBR
3
(KH) or "D" (KS) for a data block
H
Table 12-15. Meaning of the Mode Number
Description
Communications Capabilities
Low-Order Byte
Parameter set
2
Flag byte or DB number
Send mailbox
1
Data identifier
Send mailbox
3
Data word number
Receive mailbox
2
Flag byte or DB number
CBS
1
Data identifier
CBS
3
Data word number
CBR
2
Flag byte or DB number
Mode number
H
Absolute
Address
EA60
EA62
EA64
EA66
EA68
EA6A
EA6C
EA6E
)
12-41
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