7
Weighted input operation
Refer to section
for electrical connection details.
This chapter describes the special weighted digital input mode available on the PM4-BC. To operate
in this mode the
SEt INPt
function must be set to
d.inP
.
The weighted digital input mode allows up to 8 inputs to be given weighted values, these weighted
values are added together for each active input. The added values will be displayed and can be
retransmitted if an analog or serial retransmission option is fitted.
The functions which control this mode are
d.inP
which allows the number of digital inputs
required to be set from 1 to 8 and
di 1
,
di 2
,
di 3
etc. which allows the weighting for each
input to be set. The weighting value can be set to any display value.
Example
- Four weighted inputs are to be used with the weighted values to be added, displayed
and retransmitted as a 4-20mA signal using optional analog retransmission. The display is to have
two decimal points and each weighted input in turn is to be given a value of 1.00, 3.00, 5.00 and
10.00 mA. The input signals are to be from a switch inputs with a short circuit to ground being
the active signal i.e. active low operation. The retransmission output is set to give a 4mA output
when the display shows 0.00 and a 20mA output when the display shows 16.00. Note that whilst
the display can show a value greater than 16.00 the analog retransmission is limited to 20mA. The
main settings required for this example are:
Function
Setting
Description
REC_
0.00
Sets display value of
0.00
for 4mA output
REC~
16.00
Sets display value of
16.00
for 20mA output
dCPt
0.02
Sets decimal point to 2 places
dinP
4
Sets number of weighted inputs to 4
di 1
1.00
Sets first input weighting to 1.00
di 2
3.00
Sets second input weighting to 3.00
di 3
5.00
Sets third input weighting to 5.00
di 4
10.00
Sets fourth input weighting to 10.00
SEt INPt d.inP
Sets input type to weighted digital input
dAtA POL Lo
Sets input type to active low operation
PM4BCMAN-2.0-0
37 of
Summary of Contents for PM4-BC
Page 7: ...3 5 Parallel BCD input PM4BCMAN 2 0 0 7 of 40...
Page 8: ...3 6 Strobed BCD input 8 of 40 PM4BCMAN 2 0 0...
Page 9: ...3 7 Addressed BCD input PM4BCMAN 2 0 0 9 of 40...
Page 10: ...3 8 Parallel binary input also used for Gray code 10 of 40 PM4BCMAN 2 0 0...
Page 11: ...3 9 Strobed binary input also used for Gray code PM4BCMAN 2 0 0 11 of 40...
Page 12: ...3 10 Addressed binary input also used for Gray code 12 of 40 PM4BCMAN 2 0 0...
