Siemens SIMATIC TI505 Betriebsanweisung PDF herunterladen (Seite 14)

Simatic/TI 505 Ethernet Driver Help

DWord, Float

System Status

Bit Access

STW<address>.<bit>

STW<address>:<bit>

STW<address>,<bit>

1-65536

Bit 0/1-15/16

0/1-Based Bit

Addressing

Boolean,

Short, Word

Read/Write

Timer/Counter Preset TCP<address> 1-65536

1-65535

Short, Word

Long,

DWord, Float

Read/Write

Timer/Counter Current TCC<address> 1-65536

1-65535

Short, Word

Long,

DWord, Float

Read/Write

Drum Step Preset DSP<address> 1-65536

1-65535

Short, Word

Long,

DWord, Float

Read/Write

Drum Step Current DSC<address> 1-65536

1-65535

Short, Word

Long,

DWord, Float

Read/Write

Drum Count Preset** DCP<drum>.<step>

DCP<drum>:<step>

DCP<drum>,<step>

drum 1-65536

step 1-16

Short, Word Read/Write

Drum Current Count DCC<address> 1-65536

1-65535

Short, Word

Long,

DWord, Float

Read Only

*X, Y, and C memory types are supported on the 565 model controller by setting the TI565 checkbox in

Communications Parameters.

**DCP registers must be accessed in groups of 16 words. Therefore, when writing to a DCP register, the driver

performs a read to obtain the current values of all 16-word values (DCP00001.01 - DCP00001.16). The driver

modifies the one register that is being written to and sends the 16 values to the device. Since the driver performs

this read/modify/write procedure, it could be possible for any one of the registers to change between the read

and write transaction. The result would be a new value being written over by an older value. It is recommended

that users write to another type of memory location (such as Vxxxxx). If using a ladder, transfer the value to a

DCP register.

***For more information, refer to String Support.

Array Support

Non-Boolean addresses accept array notation. To view data as an array, append '[rows][cols]' to an address

(e.g., V500 [2][2], V100 [12]).

String Support

Standard String

The Simatic/TI 505 Ethernet driver supports reading and writing V registers as an ASCII string. When using V

registers for string data, each register will contain two bytes of ASCII data. The order of the ASCII data within a

given register can be selected when the string is defined. The length of the string can be from 2 to 250 bytes and

is entered in place of a bit number. The length must be entered as an even number. The byte order is specified

by appending either a "H" or "L" to the address.

Null Terminated

This type of string is a Standard String with LoHi byte order that is null terminated at all times. This means the

last byte will always be a null terminator, essentially losing one character place when compared to a Standard

String with LoHi byte order.

Length + String

This type of string is also a Standard String with LoHi byte order except the MSB of the first word contains the

desired length of the string to follow. This means one character place is lost when compared to a Standard String

with LoHi byte order. Based on this length, a string is formed up to the maximum size set by the address range

(ie. (<last word> - <first word>) / 2 - 1 bytes). The maximum length of the string can vary between the length

byte value and (<last word>-<first word>) / 2 - 1 bytes.

Note: Any null terminators in the string can cut the length short of these maximum lengths. If a string to be

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

bytes contain a non-NULL value.

Blank-Padded on Right

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