Parameters accessible with Function Code 03, 06,10h
Overview
42 HC900 Process Controller Communications User Guide Revision 13
April 2017
6. Parameters accessible with Function Code 03, 06,10h
6.1 Overview
What’s in this section?
Section 6 describes all parameters accessible by Function Code 03, 06 and 10h. Your particular controller
may not contain all parameters shown. If you see a function that is not on your controller, either it is not
available for that controller model or it is not in your configuration.
Considerations for SIL-compliant Controllers
For SIL-compliant controllers such as C30S, C50S, etc, it must be noted that if a function block or variable
is on a Safety worksheet, then all the parameters or values for that block or variable is READ-ONLY. This
overrides all description of blocks/variables in the sections below. If the function block is on a Process
worksheet, then the description of blocks/variables in the below sections apply as described.
How parameters are mapped to addresses
There are two methods available for accessing Modbus parameters:
Use a fixed map to access pre-defined parameters at fixed addresses. These parameters and their
fixed addresses are described in Sections 6.2 through 6.17.
Build a custom map to assign parameters to any addresses. These parameters are described in
Sections 6.2 through 6.17. Also, the custom map can contain additional parameters not available to
the fixed map, see Section 6.18. The custom map uses the fixed map’s address assignments as the
default but, unlike the fixed map, you can change these addresses and assign any parameter to any
address. Therefore, the addresses shown for the fixed map don’t necessarily apply to your custom
map. You can see the custom map addresses in HCDesigner, as well as view or print the custom
map.
Your version of HC 900 configuration (pre-4.0 or 4.0 and up) determines the type of address mapping
available, see table below.
Available in all HC900 configuration versions
Available in HC900 configuration version 4.0 and
higher. Certain blocks can be assigned to the custom
map that are not available in the fixed map. (See
section 6.18.)
Contains limited types of parameters in limited
quantities (e.g., 32 loops max)
More parameters to choose from and unlimited
quantities (e.g., >32 loops)
Function block type (e.g. loop) can be assigned to any
address partitioned for that block type.
Can create from scratch or can import fixed map for
customization. Function block type (e.g. loop) can be
assigned to any address or to multiple addresses.
Parameters are partitioned using fixed partitions
according to type (e.g. loops 1-24, SP Programmers 1-
4, etc.)
Parameters need not be partitioned or can use custom
partitions
Can use fixed addresses, or can assign parameters to
desired addresses
Can access only the parameters shown in the fixed
map
Can access the same parameters as the fixed map but
can use any addresses. Can access additional
parameters not available in fixed map.
Contains gaps in addresses especially between
Address gaps can be eliminated by assigning
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