Siemens SIMATIC TI505 Uživatelská příručka stáhnout pdf (Strana 15)

Simatic/TI 505 Ethernet Driver Help

This type of string is a Standard String with LoHi byte order except the string length is always the maximum

because the string is padded with blank spaces on the right until its length becomes the maximum (no NULLs).

Recall the maximum length of the string is (<last word> - <first word>) / 2 bytes in the address. If a string to be

written is less than this maximum length, it too will be padded on the right with blank-spaces until all maximum

bytes contain a non-NULL value.

Example 1: Standard String

To address a string starting at V200 with a length of 50 bytes and HiLo byte order, enter V200.50H.

Example 2: Standard String

To address a string starting at V500 with a length of 38 bytes and LoHi byte order, enter V500.38L.

Example 3: Null Terminated

Given:

V200/MSB = 'h'

V200/LSB = 'e'

V201/MSB = 'l'

V201/LSB = 'l'

V202/MSB = 'o'

V202/LSB = ' '

V203/MSB = 'w'

V203/LSB = 'o'

V204/MSB = 'r'

V204/LSB = 'l'

V205/MSB = 'd'

To address a null-terminated string starting at V200 with a length of 10 bytes and the memory data is as stated

above:

V200-204C would read "hello wor".

Note: Only 9 characters can be displayed because the last is the null terminator.

Example 4: Length Byte + String

Given:

V200/MSB = 0x04

V200/LSB = 'e'

V201/MSB = 'l'

V201/LSB = 'l'

V202/MSB = 'o'

V202/LSB = ' '

V203/MSB = 'w'

V203/LSB = 'o'

V204/MSB = 'r'

V204/LSB = 'l'

V205/MSB = 'd'

To address a string with length byte information, starting at V200 and the memory data is as stated above:

V200-204P would read "ello".

Note: The length byte is 0x04 so only 4 characters are displayed. If the length byte were 0x07, V200-204P

would read "ello wo".

Example 5: Blank-Padded on Right

Given:

V200/MSB = 'h'

V200/LSB = 'e'

V201/MSB = 'l'

V201/LSB = 'l'

V202/MSB = 'o'

V202/LSB = NULL

V203/MSB = 'w'

V203/LSB = 'o'

V204/MSB = 'r'

V204/LSB = 'l'

V205/MSB = 'd'

To address a blank padded string starting at V200 with a length of 10 bytes and the memory data is as stated

above:

V200-204 would read "hello".

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