Hardy HI 2151/30WC Single-Scale Controller - Manual (Page 43)

Section 6: Selectable Reads
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6.4 DETAILED DATA SET FOR SELECTABLE READ(S)
1. The Selectable Read data to be input to the server is always initiated by a Block Write
Command designating the parameter number that the HI 2151 Series Weight
Controller will send to the server.

NOTE: If your 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 block write command so that the verification process can
determine if the first block write command sent is valid or not.
2. The weight controller receives the parameter number command from the server,
verifies that the parameter number is correct, processes the weight data and prepares a
response byte (an error code response number) to the server’s command.

NOTES: Changes to Block Writes/Charts should be made in program mode.
To prevent errors and erroneous data from being sent to the HI 2151 Series Weight
Controller in run mode, follow the procedures below:
1. Set the Block Number to “0".
2. Write the new parameter to the output buffer.
3. Change the Block Number from “0" to the new number.
6.5 SELECTABLE READ COMMAND SETUP PROCEDURES
1. Selectable Read Data use Block Write Number 84 (5401 hex). Block Read number 34
(2200 hex) is returned as an input to the PLC.
2. Block write number 84 allows the user to select the read data summaries desired, and
they are returned in Operator Selectable Read block 34.
Block Write Command Number 84: Select Read Data
Byte definitions:
Block Write Number 84 (54 Hex)
Select Read Type
Selectable Read Value 1
Enter parameter number (repeat parameter numbers but do not exceed
word/byte limit of the PLC)
FF (end)
Operator Selectable Read Data Number 34
Byte Definitions:
Operator Selectable Read Data Number 34 (22 Hex)
Unused Byte 00
Reads operator selectable commands setup in Block Write Number 84 (Hex)