Siemens SIMATIC S7 - Parameter Area

4-3
SM 338 Equipment Manual
(4) J31069-D401-U1-A0-7618
4.2 Parameter Area
The parameters required for presetting the SM 338 are stored in two data re-
cords in the 16-byte parameter area. This area can only be write-accessed by
the P bus. The data can also be modifi ed during running operation (i.e., dy-
namically).
Note
All bits which are not defined in the following text are reserved and must be
“0”.
Data record 0 consists of two bytes.
Data record 0 is used to enable the following functi ons.
S The channel-related diagnostics and wire break monitoring
S Alarms
The entries in byte 0 specify general enabling of channel-re late d diagnostics
and wire break monitoring for each sensor.
Channel-related diagnostics
Sensor 1
Sensor 2
Sensor 3
Sensor 4
70
Byte 0
Wire break monitoring
Sensor 1
Sensor 2
Sensor 3
Sensor 4
0: Disabled
1: Enabled
Diagnostics
These bits can be used to enable/disable generation of diagnostics (i.e., re-
porting of errors) for each position sensor.
General
Data record 0
Channel-related
diagnostics, wire
break monitoring
D
a
t
a
Communic
a
tion with the PLC