Reading Parameters Using Ct Single Word - Leroy-Somer digitax st User Manual

Table 8.5 CT Single Word Bit Definitions
Bit
0 to 7
8 to 11
12
13
14
15
Setting the stamp number to 0 resets the internal non-cyclic state machine. Allowing a
NOTE
new message to be started.
CT Single Word non-cyclic data uses only one word of data, when using this without
NOTE
data compression this requires two 16-bit words. If Mode 1 is used with compression
turned off only the least significant word of the 32-bit word is used.
8.7

Reading parameters using CT Single Word

To read 32-bit parameters using the non-cyclic channel, the following "telegrams" must
be transmitted to construct the final message:
• Telegram 1 - define menu number
• Telegram 2 - define parameter number
• Telegram 3 - request high data byte
• Telegram 4 - request mid-high data byte
• Telegram 5 - request mid-low data byte
• Telegram 6 - request low data byte
Table 8.6 CT Single Word Bit Positions
b15
READ
b7
34
Function Values
Data 0 to 255
Stamp
0 to 6
number
0 = 16-bit data
32-BIT
1 = 32-bit data
Reserved 0
0 = Data OK
ERR
1 = Error
0 = Write
READ
1 = Read
b14 b13
ERR Reserved
b6 b5
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Description
Depending on the stamp number of the telegram, this
byte contains the menu, parameter or data byte.
Indicates the stamp number of the word. This shows
which part of the message is currently in progress.
Setting the stamp number to 0 resets the internal non-
cyclic state machine.
Specifies whether a 16-bit or 32-bit data value is to be
written to or read from the drive. If 32-BIT is set,
telegrams 5 and 6 will be used to transfer the additional
data bytes.
Reserved for future use. Always set to 0.
Indicates the success or failure of the message. Failure
could occur if the parameter does not exist, or is a read-
only or write-only parameter. This bit will also be set if
the parameter value is out of range in 16-bit mode.
Defines whether the data word is part of a READ or
WRITE cycle.
b12 b11
32-BIT
b4 b3
Data Byte
SM-PROFIBUS DP-V1 User Guide
b10 b9
Stamp Number
b2 b1
b8
b0
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