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Using the data record interface
7.2 Description of the AS-i line calls and AS-i slave calls
7.2.2.8
Set offline mode (Set_Offline_Mode)
Meaning
This call switches between online and offline mode.
Online mode
Online mode is the normal mode for the AS-i master. The following jobs are processed
cyclically here:
● In the "data exchange phase", the fields of the output data are transferred to the slave
outputs for all activated AS-i slaves. In error-free transmission, the addressed AS-i slaves
transfer the values of the slave inputs to the master.
● This is followed by the "acceptance phase" in which a search is made for the available
AS-i slaves and newly added AS-i slaves are accepted into the LDS or LAS.
● In the "management phase", jobs forwarded by the user, such as writing parameters, are
executed.
Offline mode
In offline mode, the AS-i master CM 1243-2 only processes calls from the user. Calls that
immediately activate an AS-i slave are rejected with an error. Cyclic data exchange is not
performed with the AS-i slaves.
Bit assignment
The following bit assignment applies to online/offline mode:
● Online mode: "0"
● Offline mode: "1"
The bit OFFLINE = TRUE is not permanently stored, i.e. following a start/restart, the
AS-i master CM 1243-2 returns to online mode.
Structure of the utility WRREC − Index 18
Byte
Bit 7
0
1
2
0
3
74
Bit 6
Bit 5
0
0
AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200
Meaning
Bit 4
Bit 3
Version_hi = 0x00
Version_lo = 0x00
0
0
Reserved 0x00
Manual, 04/2013, A5E02655230010A/RS-AA/003
Bit 2
Bit 1
0
0
Bit 0
Mode
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