Rockwell-automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command Manuel d'utilisateur télécharger pdf (Page 116)

7–29Communication Commands

Publication

17706.5.16 - October 1996

Data Type ID (Bits 47) Data Type Size (Bits 03)

The following table contains a list of the types of data you can

read and write and the ID value of each:

If the data type defined in

the ID Value field uses

Then enter

Data Type ID Type of Data

7 or fewer bytes for each

piece of data

zero (0) in bit 3 of the flag byte. Enter the

actual number of bytes used for each

element of data in bits 0, 1, and 2 (Size

Value Field).

bit

bit string

byte (or character) string

integer

AllenBradley timer

AllenBradley counter

AllenBradley general control structure

IEEE floating point

array of similar elements

address data

binarycoded decimal (BCD)

more than 7 bytes for each

element of data

one (1) in bit 3 of the flag byte. In bits 0, 1,

and 2, you enter the number of bytes that

will contain the number of bytes used for

each element of data. These additional

size value bytes follow the flag byte and any

ID Type bytes.

For example, if each element of data used 8 bytes, then you set bit 3 to 1

(because the value 8 cannot fit into bits 0, 1, and 2). Bits two, one, and zero

would be set to 0, 0, 1 (respectively), to signify that the number of bytes per

element of data (8) will be contained in one byte that follows the flag byte

and any ID Type bytes.

If the Data

Type ID is

Then set bit 7 of the flag byte to

7 or less zero (0), and encode the ID value for the

data type in the bits 4, 5, and 6 (ID Value

Field).

greater than 7 one (1). In bits 4, 5, and 6, you insert the

number of bytes to follow that contain the

data type ID value (usually 1). These

additional ID value bytes follow directly after

the flag byte.

For example, if you were sending address data, then bit 7

would be set to 1 (because the address ID value 15 cannot fit

into bits 4, 5, and 6). Bits six, five, and four would be set to 0,

0, 1 (respectively), to signify that the data ID value (15) will be

contained in one byte that follows the flag byte.

For examples of type/data parameter, see page 7–36.

1 2 ... 111 112 113 114 115 116 117 118 119 120 121 ... 250 251

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Rockwell-automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command Manuel d'utilisateur Page 116

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