Hardy HI 2151/30WC Single-Scale Controller - Manual (Page 42)

HI 2151 Series Weight Controller
Profibus Interface Option
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Section 6 SELECTABLE READS
6.1 SCOPE
Chapter 6 covers Selectable Read Commands for the PROFIBUS Interface Option.
6.2 OVERVIEW OF TRANSFER COMMANDS
1. PROFIBUS Interface Card maximum buffer size: 112 byte buffer
2. Siemens PLC
a. TI 505 Series PLCs
Requires the Field Interface Module (FIM) to communicate over PROFIBUS.
Can continually exchange up to 32 words or 64 bytes for both PLC input and
output with each client device.
b. S5 Series PLCs
Requires IM 308C Module to communicate over PROFIBUS.
Can continually exchange up to 244 bytes for PLC input and output with
each client device.
c. S7 Series PLC
PROFIBUS ready, does not require additional modules.
Can Continually exchange up to 244 bytes for PLC input and output with
each client device.
3. Allen-Bradley PLC5 Series
a. Requires PROFIBUS DP module to communicate over PROFIBUS.
b. Can continually exchange up to 244 bytes for both PLC Input and Output with
each client device.
6.3 OVERVIEW OF SELECTABLE TRANSFER COMMANDS
1. It is important to keep in mind that the amount of bytes that can be transferred is
determined by the server PLC not the PROFIBUS interface option.
2. When using the HI 2151 Series Weight Controller PROFIBUS interface, the user can
select the Read Data Summaries and Write Commands they require. However, the
amount of bytes that can be transferred is dependent on the data transfer capability of
the server being used.
3. By sending the proper commands to the HI 2151 Series Weight Controller, the server
can specify which weighing parameters and/or status bits should be provided.
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.