Instruction Manual

HI 2151 SERIES WEIGHT CONTROLLERS REMOTE I/O OPTION

6-2

Block Write

Example

The following is an example using block write #51 to zero the scale.

Command #51 is made up of one word. Bits 0-7 represent the address

or the command number (00110011 = 51). To activate the scale func-

tion, toggle bit #13. This creates a word which has a decimal value of

8,243.

Math Conversion

Programs

Math conversion routines, written in ladder logic convert the twenty bit

integer data available from the HI 2151WC to a PLC floating point for-

mat. Conversely, routines can convert from Floating Point to integer.

To convert from integer to floating point, your ladder logic program

would follow these steps:

Step 1. Convert the lower sixteen bits into a floating point number.

Step 2. Test the seventeenth bit (bit 16) and if set, add 65,536 to the

floating point number.

Step 3. Test each subsequent bit and add the appropriate numeric

value to the floating point number.

Bit 4 0 = Off

Relay #4 status (on/off)

Bit 5 1 = On Relay #3 status (on/off)

Bit 6 1 = On Relay #1 status (on/off)

Bit 7 0 = Off Relay #2 status (on/off)

Bit # Bit Status Hex Description

TABLE 6-2: RELAY STATUS

Bit # 15 14 131211109876543210

Decimal Value 32768 16384 8192 4096 2048 1024 512 256 128 64 32 16 8 4 2 1

ONE WORD

TABLE 6-3: BINARY TO DECIMAL CHART

Bit # 0010000000110011

TABLE 6-4: BLOCK WRITE EXAMPLE