As-Interface Set-Up Methods; Bottom-Up Method; Bottom-Up, With Addressing Unit - Omron CQM1-ARM21 Operation Manual

AS-Interface Set-up Methods

5-1 AS-Interface Set-up Methods

5-2 Bottom-up Method

5-2-1 Bottom-up, with addressing unit

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There are two fundamentally different ways to build up an AS-Interface
network:
1. Bottom-up.
Actually construct the full network, then let the master unit detect what is
connected and store this in the master's non-volatile memory as the
projected configuration. This bottom-up method requires the full set of
slaves to be operational at the time of configuration.
2. Top-down.
Define the projected configuration off-line and store it in non-volatile
memory, then attach the network and make sure it matches the projected
configuration. This top-down method does not require the slaves to be
present at the time of configuration.
This is the simplest way to set up the AS-Interface network. The master will
determine the configuration from the slaves detected on the AS-Interface line.
This can be done with or without using a separate addressing unit.
Although this method will allow you to get the network in operation quickly,
any mistake made in the actual configuration of slaves cannot easily be
determined. Any combination of slaves detected on the actual network will be
stored as projected configuration, and once in Protected Mode, the master will
communicate with all these slaves, even if slaves of the wrong type or the
wrong address have been installed. In that case it is likely that the mapping of
slave I/O data to the PLC will be incorrect, but no configuration error will be
indicated.
If a separate hand-held addressing unit is available, this is the fastest way to
set up an AS-Interface system. Each slave's address is set while off-line, and
once the slaves are installed, the master will detect them.
1. Connect the AS-Interface line and power supply to the CQM1-ARM21.
2. Put the CQM1-ARM21 in Configuration Mode. (MOD switch OFF, Mode
bit IR m.01 OFF).
3. Use a separate addressing unit to assign addresses to all slaves before
installation.
4. Connect all slaves to the AS-Interface cable. When a slave is detected,
the associated slave indicator LED on the CQM1-ARM21 will flash.
5. If necessary, set the slave parameters using Setup Mode (see 4-5-3-9,
Write_Parameter).
6. Toggle the SET switch (OFF→ON) to copy the actual configuration to the
permanent configuration (Put the SET switch back to OFF position).
7. The CQM1-ARM21's slave indicators for the active slaves should be ON,
none should flash, and the CERR LED should go OFF.
8. Put the CQM1-ARM21 in Protected Mode (MOD switch ON).
Section 5-1