Micromod Micro-DCI: 53SL5100B Single Loop Controller Uživatelský manuál stáhnout pdf (Strana 105)

53SL5100B Single-Loop Controller

INSTRUCTION MANUAL

Calculating Data Addresses

If communications software must be generated to accommodate unique Datalink applications requirements,

then the instrument memory address scheme must be known for proper data bit (e.g., L data type) and data

byte (e.g., B, C, H, and A data types) memory location determination.

 NOTE: Numbers used in this section that are expressed in hexadecimal notation (base 16) are

identified with an H after the number.

This memory address scheme applies only if a 6 is in memory address location 8002H. Memoryaddress

location 8002H must be read and if it contains a 6, then the address scheme that is described in Table B-3

should be applied for this instrument.

Table B-3. Instrument Memory Address Scheme

Data

Type

Base

Memory

Address

Byte

Size

Data Format Address Calculation Algorithm

B 200H 1 Represents a positive integer with

values from 0 to 255.

Address = B Base + (B Number)

= 200H + (B Number) Address

example: B012 location = 200H + 12D

= 200H + CH = 20CH

L 500H 1 Bit A single binary bit with a logical

value of 0 or 1. L datapoints are

packed 8 to a byte.

Address = L Base + (L Number/8)

= 500H + (L Number/8)

Remainder = bit position in byte

Address example: L014 location =

500H + 14/8 = 501H, bit 6 (remainder).

C 600H 3 Represents floating point values that

have a resolution of one part in

32,768 (15 bits) and a dynamic

range of ± 1038 . The first two bytes

represent a 2’s complement notation

in fractional form (2-n ) whose

absolute value is between 0.5 and

0.9999. The third byte is the power

of 2 in 2’s complement notation.

Floating point example: 64H 00H

07H = 100D (Decimal) 64H = 0110

0100, fractional binary weights left to

right are 0 = 2’s complement

positive, 1 = 2-1 = 1/2 = 0.5, 1 = 2-2

= 1/4 = 0.25, 0=0, 0=0, 1 = 2-5 =

1/32 = 0.03125, 0=0, and 0=0. 64H =

0.5+0.25+0.03125 = 0.78125.07H =

128D. 128D X 0.78125D = 100.

Address = C Base + (3 X C Number)

= 600H + (3 X C Number)

Address example: C011 location

600H + (3 X 11) = 600H + 33D

= 600H + 21H = 621H.

1 2 ... 100 101 102 103 104 105 106 107 108 109 110 ... 114 115

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