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Siemens TCP/IP Ethernet Driver Help

KL vs. KR vs. DBB

KL and KR determine whether the left byte or right byte of the data block word is returned.

Value 8 9 A B C

Byte 0 1 2 3 4

The following examples are from the table above.

Example 1

DB1:KH0=0x89.

DB1:KL0=0x8

DB1:KR0=0x9

DB1DBB0=0x8

Example 2

DB1:KH1=0x9A

DB1:KL1=0x9

DB1:KR1=0xA

DB1DBB1=0x9

Timers

The Siemens TCP/IP Ethernet Driver automatically scales T and KT values based on the Siemens S5 time format.

Timer data is stored as a Word in the PLC but scaled to a DWord in the driver. The value returned for either a T or

KT memory type will already be scaled using the appropriate Siemens time base. As a result, the values are

always returned as a count of milliseconds. When writing to T or KT memory types, the Siemens time base will

also be applied. To assign a value to a timer in the controller, write the desired value as a count of milliseconds to

the appropriate timer.

Counters

The value returned for either C or KC memory type will automatically be converted to a BCD value. DB1:KH0 @

BCD=DB1:KC0 @ Word.

Examples

1. To access bit 3 of internal memory F20, declare an address as follows: F20.3

2. To access data block 5 as word memory at byte 30, declare an address as follows: DB5:KH30

3. To access data block 2 byte 20 and bit 7, declare an address as follows: DB2:KM20.7

4. To access data block 1 as left byte memory at byte 10, declare an address as follows: DB1:KL10

5. To access internal memory F20 as a DWORD, declare an address as follows: FD20

6. To access Input memory I10 as a Word, declare an address as follows: IW10

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Siemens IP-Module Especificaciones Pagina 62