Omron CQM1-ARM21, Operation Manual

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AS-Interface Standard Modes
Section 4-4
31
4-4 AS-Interface Standard Modes
Protected Mode and Configuration Mode are the modes of operation in which
the CQM1-ARM21 acts as an ’M0’ AS-Interface Master, and cyclically
exchanges I/O data between the host PLC and the slaves. The other mode of
operation is Setup mode, in which the Unit acts as a configuration tool,
allowing the user to modify the AS-Interface configuration.
In these standard modes, the I/O words assigned to the CQM1-ARM21 will
represent the I/O data of the connected AS-Interface slaves. The number of
allocated I/O words depends on the setting of the CH switches 1-3 (see 2-1-3
Switches).
Apart from the I/O data, the first input word contains 4 bits indicating the
status of the AS-I master, and the first output word contains 2 bits to control
the AS-Interface master.
The first input word allocated to the Unit is indicated as IR n (n = 001~006).
The first output word allocated to the Unit is indicated as IR m (m = 100~106).
The Status Flags are inputs to the PLC Host system that indicate the state of
the AS-Interface system. The Command bits are outputs from the PLC Host
system to the AS-Interface master to control its operation mode.
4-4-1 Status Flags
IR n.00 Mode Flag
0 Standard Operation Modes.
The AS-Interface Master is in Configuration Mode or in
Protected Mode. I/O data exchange between PLC and
slaves is active.
1 Setup Mode (see 4-5, Setup Mode)
I/O data exchange between PLC and the master is partially
suspended (inputs of slaves 1~3, outputs of slaves 1~7).
Data exchange between master and slaves continues.
IR n.01 System Error Flag
0 No errors.
1 An error was detected, being either:
•
Low Power on the AS-Interface line.
•
Hardware failure of the Master Unit.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
IR n
Mode Flag (standard modes=0)
System Error Flag
Normal Operation Flag
Configuration_OK Flag
Input data from Slaves 1-3