Slave Mode; Overview - Hitachi HIDIC EH-150 Applications Manual
Devicenet master module(eh-rmd)/ slave controller(eh-iocd)/ discrete i/o slave unit (rdx16d,rdy16tp,rdy16r)
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Also See for HIDIC EH-150:
- Applications manual (114 pages) ,
- Instruction manual (29 pages) ,
- Applications manual (20 pages)
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Chapter 9
In addition to having the functions as a master/scanner that can perform I/O communication with one or more
slaves, the EH-RMD supports the slave mode in which it can perform I/O communication with other EH-RMD
modules and/or master modules made by other companies.
It is possible to use one EH-RMD as a master at one time and in the slave mode at another time.
9.1
Overview
This section shows an example of a system configuration where the EH-RMD is used in the slave mode.
Figure 9.1 shows an example of a system configuration where the EH-RMD is used as the master and performs I/O
communication with the slaves, including an EH-RMD operating as a slave.
The I/O on PLC2 is controlled by the CPU module on PLC2. PLC1 exchanges the necessary information with PLC2
via the EH-RMD modules (both master and slave).
The I/O data size of the EH-RMD in the slave mode is set in the configurator.
Figure 9.1 System configuration example 1 illustrating the use of the slave mode
Figure 9.2 illustrates a system example configured for the purpose of sharing information of each PLC by making
each EH-RMD run as master and/or slave.
In DeviceNet, a slave device cannot communicate with multiple masters. Thus, unlike a common CPU link system,
it cannot send data to multiple PLCs.
Figures 9.3 and 9.4 show how to use the link area of the H series CPU link module and the link area in a link
system constructed by means of EH-RMD modules.
Figure 9.2 System configuration example 2 illustrating the use of the slave mode
Slave Mode
EH-RMD (master)
PLC1
EH-150 CPU
HITACHI RXD16D
HITACHI RXD16D
M S
M S
N S
N S
EH-RMD (master) or a
master module made by
another manufacturer
PLC1
PLC2
PLC2
EH-150 CPU
PLC3
EH-RMD (slave)
9-1
Chapter 9 Slave Mode
EH-RMD (slave)
EH-IOCD
0
1
2
3
0
1
2
3
0
1
2
3
0
1
2
3
0
1
2
3
PO WER
4
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7
4
5
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7
E H -1 5 0
4
5
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7
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7
4
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9
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8
9
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15
EH-RMD (slave)
HITACHI RXD16D
M S
N S
EH-RMD (master & slave)
PLC4
HITACHI RXD16D
M S
N S
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