Hardy HI 2151/30WC Single-Scale Controller - Manual (Page 52)

HI 2151 Series Weight Controller
Profibus Interface Option
46
4. The ladder logic program provides the server with the ability to read
and write weight data by referencing the PROFIBUS address, the
parameter numbers and number of bytes.

NOTE: The decimal point is not included in values transferred. The decimal position is a separate
parameter.
7.4 DETAILED COMMAND SET FOR SELECTABLE WRITES

NOTE: We recommend that front panel functions be controlled through the PROFIBUS network
and that the front panel control be disabled or locked out. (See the HI 2151/20 WC
Operation and Installation Manual (#0596-0178-B), Section 6, Paragraph 6.3 or HI
2151/30 WC Operation and Installation Manual (#0596-0224-A) Section 4, Paragraph
4.12, for lockout instructions)
1. All write commands are initiated by the server using a ladder logic program to send the
desired parameter number(s) to the HI 2151/20WC weight controller via the
PROFIBUS Interface Card. The weight controller receives a parameter number
command, verifies that the parameter number is correct, processes the weight data and
prepares a response byte (an error code response number) to the PLCs command.

NOTE: If you server Device does not have built in PROFIBUS diagnostic capability set up the
Response/Error “0" diagnostics first, (See Section 4.4) before proceeding. The write “0"
must be set before entering a selectable write command so that the verification process can
determine if the first selectable write command sent is valid or not.

NOTE: The write “0" should be the first command written, to ensure that the error codes are
displayed on the server screen.
7.5 SELECTABLE WRITE COMMAND SETUP PROCEDURES
1. Use Block Write Number 83 - Personalized Selection of Write Commands.
2. This block allows the user to select as many write commands up to the byte limit of the PLC.
Block Write Command Number 83: Personalized Selection of Write
Commands
Byte definitions:
Block Write Number 83 (Hex 5300)
Unused Byte 00
Enter Parameter Number
Unused Byte
Enter Byte Value
(Repeat for all Write Commands, but do not exceed PLC word/byte limit)
FF (end)
FULL WORD VARIABLES MUST BEGIN ON WORD BOUNDARIES,
WHEN TRANSFERRING OPERATOR SELECTABLE COMMANDS OR
DATA. SEE EXAMPLE BELOW