GEMTEQ I/O 3. GEM80 GEMCAN NETWORK
3.3.4 Change-Over
Master
GEMC AN I/O Scan n er
Mo d u le 1
GEMC AN I/O Scan n er
Mo d u le 2
GEM80-500
Changeov er
Master
Po rt A
Po rt B
Po rt C
Po rt D
I/O
Module
a
b
I/O
Module
a
b
I/O
Module
a
b
T
GEMC AN I/O Scan ner
Mo d ule 1
GEMC AN I/O Scan n er
Mo d ule 2
GEM80-500
Po rt A
Po rt B
Po rt C
Po rt D
T
Changeov er
Master
'X'
'Y'
T : Termination Resistor
Figure 3-7
GEMCAN I/O Scanner – Change-over Master Operation
A Change-over Master is intended to be used when the host PLCs are configured to operate as a
change-over pair. The two host PLCs and I/O Module slaves should be connected to the same
CAN network. Whichever PLC (‘X’ or ‘Y’) first becomes active on the CAN network, it will adopt
master-ship and by virtue of it producing node guard packets, hold the 2
nd
changeover master off.
3.4
DATA EXCHANGE WITH HOST CONTROLLER
Each slave device on a GEMCAN network can exchange a maximum of 16 words of input data
and a maximum of 16 words of output data, with the master host GEM80 controller. These 16
words are received and transmitted as 4 Process Data Objects (PDOs) each of length 4 words.
When the GEMTEQ scanner is configured as a master the module uses the declared C/D tables
within the ladder to determine if a slave module should be present. When declared the master will
try and transfer data and node guard the module ID associated with the declared C/D table.
If no C/D tables are declared then no communication will take place on the GEMTEQ network.
In the case of the GEM80-500, the master determines which PDOs to transmit and which PDOs it
expects to receive by which C & D-Tables are present in the user program. The following C/D-
Table allocation is used to communicate with Node ID 1.
GEMTEQ I/O Technical Manual (T2031En)
Rev.02 (10/10)
Page 3-7
Содержание GEMTEQ I/O GEM80
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