EPA SM-Ethernet, User Manual

Page: 38 / 133

SM-Ethernet User Guide
37
Issue: 7
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6.7.11 Configuring the PLC
Due to the many different makes of PLCs available, the information in this section may
not be relevant to all types of PLCs. The information supplied in this section relates to
the “ControlLogix” family of controllers supplied by “Allen Bradley”.
When configuring the PLC for cyclic communication with SM-Ethernet, the length of
each parameter data word and the number of parameters must be specified correctly,
Figure 6-2, shows the PLC configuration for 40 input parameters and 40 output
parameters, as each parameter consists of 32 bits (4 bytes), the length of each data
word should be set to 32 bits (DINT - double integer word).
The length of each data word (
Comm Format in the PLC configuration in Figure 6-2 )
must normally be configured when the Ethernet module is created within the PLC and
can not be changed. If a different length is required then a new Ethernet module must
be created.
In order to communicate with the SM-Ethernet, the PLC must have the SM-Ethernet IP
address set correctly as illustrated in Figure 6-2.
Figure 6-2 PLC configuration
6.7.12 Assembly objects
An assembly object is an object which contains a group of attributes to control or
monitor the drive operation. These attributes can be members of EtherNet/IP
objects or drive parameters. SM-Ethernet supports a series of standard assembly
objects (see section 6.7.13
Supported drive assembly objects on page 38) and two
Control Techniques objects to access the drive parameters.
Although the Allen Bradley PLCs are mentioned in this document, this does not repre-
sent an endorsement of any particular PLC type or PLC manufacturer.
NOTE
SM-Ethernet IP address.
Length of each data word.
Number of data words
(parameters).
Table 6.3 Control Techniques assembly objects
Number Type Length Default Length Default Mappings
(bytes) (bytes) Bytes 0 to 3 Bytes 4 to 7
0x64 (100
10
)
Input 4 to 160 8 Pr 10.40 Pr 2.01
0x65 (101
10
)
Output 4 to 160 8 Pr 6.42 Pr 1.21