GEMTEQ I/O 3. GEM80 GEMCAN NETWORK
3.3.3 Redundant
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
Redundant
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
T
T
T
Redundant
Master
T : Termination Resistor
Figure 3-6
GEMCAN I/O Scanner – Redundant Master Operation
A Redundant Master generally operates the same as a Standard Master, except that both Port A and
Port B can communicate with Slaves 1 to 125. It is assumed that Slave ‘x’ on Port A and Slave ‘x’ on
Port B are the same physical device. Similarly for Ports C and D on GEMCAN I/O Scanner 2.
In this configuration an I/O Module will transmit its data on both CAN networks and then the GEMCAN
I/O Scanner Ports will then place this in the same area of memory. Conversely the same data will be
taken by Ports A and B and transmitted to the same Slave Node ID. As long as an I/O Module detects
that the network attached to Port A is operational, it is this data that the I/O Module will use, otherwise
data from Port B will be used.
If Port A/C is configured as a Redundant Master, then Port B/D must also be configured as a
Redundant Master and visa versa.
The Masters periodically send Node Guard messages to each node, to check for their presence on
the CAN networks and that they are in an operational state.
GEMTEQ I/O Technical Manual (T2031En)
Page 3-6
Rev.02 (10/10)
Summary of Contents for GEMTEQ I/O GEM80
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