Yokogawa DO202 2-Wire Dissolved Oxygen Analyzer - Manual (Page 49)

IM 12A00A01-61E
3-44 Foundation Fieldbus
3-7-2 Setting and change of basic parameters
This section describes the procedure taken to set and change the parameters for each block. Obtaining
access to each parameter differs depending on the configuration system used.
For details, refer to the instruction manual for each configuration system.
Set the Target of block mode (MODE_BLK) to Auto,
Man or O/S (*Note 2) according to the Write Mode of the
parameter to be set or changed.
When “actual mode” has changed (*Note 1),
data associated with the function block
can be maintenanced.
Access the block mode (MODE_BLK) of each block.
back to Auto (*Note 2) .
Set the Target (*Note 1) of block mode
IMPORTANT
Do not turn the power OFF immediately after parameter setting. When the parameters are saved to the
EEPROM, the redundant processing is executed for an improvement of reliability. Should the power be
turned OFF within 60 seconds after setting of parameters, changed parameters are not saved and may
return to their original values.
Note 1: Block mode consists of the following four modes that are controlled by the universal parameter that
displays the running condition of each block.
Target: Sets the operating condition of the block.
Actual: Indicates the current operating condition.
Permit: Indicates the operating condition that the block is allowed to take.
Normal: Indicates the operating condition that the block will usually take.
Note 2: The following are the operating conditions which the individual blocks will take.
Refer to the “List of parameters for each block of the EXA” for details of the Write Mode for each block.
AI Function Block Transducer Block resource Block
Automatic (Auto) Yes Yes Yes
Manual (Man) Yes
Out of Service (O/S) Yes Yes Yes
3-7-3 Setting the AI Function Blocks
(1) Setting the output scale
As explained in section 3-3-6-4 the OUT_SCALE can used to convert the channel’s value to a different
scale. If the channel’s unit (= XD_SCALE unit) is the same as the output unit DO NOT use scaling or let the
OUT_SCALE have the same scaling as XD_SCALE. If L_TYPE is set to Indirect or Ind Sqr Root, OUT_SCALE
determines the conversion from FIELD_VAL to the output. PV and OUT always have identical scaling. OUT_
SCALE provides scaling for PV. The PV is always the value that the block will place in OUT if the mode is Auto.
For AI1 set L_TYPE to Direct