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Operating Instructions
Chapter
5
Flexi Soft Gateways
8012664/XB29/2013-06-11
© SICK AG • Industrial Safety Systems • Germany • All rights reserved
69
Subject to change without notice
Ethernet gateways
Transmit (From PLC) Data Transfer Methods
The FX0-GENT will support the following methods of receiving or retrieving the output data
set(s) from the PLC.
PLC Writes Method
This is the standard method where the PLC uses a message instruction to write the
output data sets to the FX0-GENT. With this method, the output data sets can be
updated via a PCCC message written to the corresponding file/address location on the
FX0
R
GENT.
Read-from-File Transmit Method (Poll the PLC)
With this method, the FX0-GENT will monitor the configured PLC memory location for
changes to the output data set(s). When a change is detected, the output data sets will
be processed accordingly.
The following restrictions apply to this method:
– The output data set file locations must be of INTEGER (16 bit word) format and must
be of sufficient length to contain the entire output data set.
– Data in the INTEGER file must be formatted with the first byte placed in the MS byte
location.
Example:
aabb, ccdd, eeff, etc. where aa = byte 1, bb = byte 2, cc = byte 3, etc.
PLC-5 and SLC Messages
The following PCCC messages are supported for the PLC-5, SLC and MicroLogix PLCs:
Message type
PCCC message
Maximum message size
SLC Typed Read
162
CLX: 242 SINTs (121 INTs)
SLC: 206 SINTs (103 INTs)
SLC Typed Write
170
CLX: 220 SINTs (110 INTs)
SLC: 206 SINTs (103 INTs)
PLC-5 Typed Read
104
CLX: 234 SINTs (117 INTs)
SLC: 252 SINTs (126 INTs)
PLC-5 Typed Write
103
CLX: 226 SINTs (113 INTs)
SLC: 226 SINTs (113 INTs)
Both the PLC-5 and SLC Typed Read message can be used to retrieve all input data sets.
Tab. 51: Supported PCCC
messages for the PLC-5, SLC
and MicroLogix PLCs
Note