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SmarTec S CLD 132 PROFIBUS-PA/-DP
Operation
Hauser
17
Selecting the operating mode
The operating mode is set by means of the MODE_BLK parameter group. The Analog
Input function block supports the following operating modes:
•
AUTO (automatic mode)
•
MAN (manual mode)
•
O/S (out of service)
Selecting the units
The system unit for one of the measured values can be changed via Commuwin II in the
Analog Input Block.
Any change to the unit in the Analog Input Block does not initially have any influence on
the measured value being transferred to the PLC. This ensures that an abrupt change
cannot have any influence on the subsequent control. If the unit change has an
influence on the measured value, activate the SET_UNIT_TO_BUS function using
Commuwin II.
Another way of changing the unit is to use the PV_SCALE and OUT_SCALE parameters
(see Page 18 "Rescaling the input value").
OUT
The OUT output value is compared with warning limits and alarm limits (e.g. HI_LIM,
LO_LIM), which can be entered via various parameters. If one of these limit values is
violated then this triggers a limit value process alarm (e.g. HI_ALM, LO_ALM).
OUT Status
The status of the Analog Input function block and the validity of the OUT output value
are relayed to the downstream function blocks by means of the status of the OUT
parameter group. The following status values can be displayed:
•
GOOD_NON_CASCADE
The OUT output value is valid and can be used for further processing.
•
UNCERTAIN
The output value OUT can only be used for further processing to a limited extent.
•
BAD
The OUT output value is invalid. Occurs when the Analog Input function block is
switched to the O/S operating mode (Out of Service) or in the event of a serious error
(see status codes Page 22 and system or process error messages in the Operating
Instructions BA 207C/07/en).
In addition to the device-internal error messages, other device functions have an
influence on the status of the OUT value:
•
Automatic hold
If "Hold" is switched on, the OUT Status is set to BAD not specific (0x00).
•
Calibration
During calibration, the OUT Status is set to the UNCERTAIN sensor calibration value
(0x64) (even when hold is switched on).
Содержание PROFIBUS-DP
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