Eurotherm 6100, User Manual

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100/180MM DISTRIBUTED GRAPHIC RECORDER: USER GUIDE
HA029324
Issue 11 Oct 14 Page 151
4.3.16 MASTER COMMS (Cont.)
RECORDER/DAQ CONFIGURABLE PARAMETERS (Cont.)
TYPICAL RECORDER PARAMETERS
The following parameters may be accessible from a recorder or data acquisition unit, depending on
model number. Figure 4.3.16e, above, refers
Notes:
1. Items such as Scale, Zone and descriptor may be editable (white background) or not (grey back-
ground), depending on model.
2 This description includes only those items which are unique to input channels with Input Type =
Master Comms. For other items please see section 4.3.3 .
Channel Number Allows the user to select the number of the channel to be confi gured. As soon as
Modbus master is selected as input type, the display changes from ‘Channel 1’ (for
example) to ‘Read 1’. This legend stays as ‘Read 1’ ‘until a descriptor is entered (be-
low), which immediately overwrites it.
Slave Allows the user to select (from a picklist), the slave from which data is to be retrieved.
The picklist contains all the Remote Devices confi gured as slaves in the
Master
Comms Confi guration described above.
Digital Allows data to be read into a digital input .
Parameter Allows the user to select Alarm setpoints, Process Value, Batch status (model de-
pendent) or ‘User defi ned’ to be selected. ‘
User defi ned ’ allows a (decimal) register
address to be entered
Scaling For some slaves, scale zero (scale low) is returned as value 0 and full scale (scale high)
as value 65,535 (Hex FFFF) with intermediate values having proportionate values.
For example the value 15, would be represented as 32,767 (7FFF) for a channel scale
0 to 30, as would a value of 50 for a channel scaled 0 to 100, and a value of 45 for a
channel scaled 30 to 60. In order to convert this reading to an understandable value,
a scaling factor must be entered. If the low and high scale entries match the slave
channel’s scale, the master reading will be the same as the slave’s reading.
Selecting ‘High/Low’ allows Scale low and Scale high values to be entered for the
selected parameter. If ‘None’ is selected, the process value is displayed as a propor-
tion of 64k.
Point type This item appears for Alarm setpoints and Process Value parameters only. Point type
allows the relevant point type (i.e. input channel, maths channel, totaliser etc.) in the
slave to be selected.
Point number This item appears for Alarm setpoints and Process Value parameters only. Point
number allows the relevant point number in the slave to be selected.
Group Number This item appears for Parameter = ‘Batch Status’ only. Group number allows that
group, the status of which is to be read, to be defi ned.
Process Value Allows one of three rates to be set for reading the Process Value. The three rates
(Low, Medium and High) have the values set in the
Master Comms confi guration .
Span Where the input value is scaled (see above), this ‘Span’ setting sets the Zero and Full
Scale values for the channel. This is different from the situation obtaining in input
channels, where span and scale have different meanings.
Remaining items are as described in Channel Confi guration in section 4.3.3 .