Set Point Limiter; How To Use The Remote Sp - Omron E5EK DEVICENET User Manual

4.3 How to Use the Remote SP

J Scaling
F Relationship with

set point limiter

J SP mode
LSP
SP mode
RSP
RSP enable
• Taking a remote SP input (4 to 20 mA) as the set point is referred to
as the "remote SP" function. The remote SP function is enabled only
when the "remote SP (RSP) enable" parameter (option mode) is set to
"ON".
• Remote SP upper-and lower-limit values can be set by scaling.
• Inputs within the range 4 to 20 mA (-10 to 110%) are allowed as
remote SP inputs. Inputs not within this range are regarded as out-of-
range input values. In this case, input is clamped at the remote SP
lower or upper limit values, and the "RSP" LED blinks.
• If the output function "RSP input error" is assigned for when an out-
of-range remote SP is input, the "RSP input error" output is turned
ON. Control output also switches to the setting of the "MV at PV
error" parameter.
• Set the upper limit value in the "remote SP upper limit" parameter
and the lower limit value in the "remote SP lower limit" parameter
(option mode).
RSP (%)
Upper limit value
Lower limit value
• When the "SP setting upper limit" or "SP setting lower limit" param-
eters are changed, the remote SP upper-and lower-limit values are
forcibly changed to the set point upper-and lower-limit values. The
following example shows how the remote SP upper-and lower-limit
values are changed when the set point upper limit value is changed
from A to B.
Before change
Changed to
upper limit value
Upper-and lower-limit values of the limiter
RSP scaling upper-and lower-limit values
• The set point held internally by the E5EK-DRT controller is referred
to as the "local SP (LSP)."
• Use the "SP mode" parameter to switch between the remote SP and
local SP . When the SP mode parameter is set to "
the "RSP" LED lights. When the SP mode parameter is set to
" ", the controller is in the local SP .
4.3 How to Use the Remote SP
Out-of-range input
(blinks of upper-and lower-limit values)
4 20
21.6 (-110%)
2.4 (-10%)
Set point limiter
RSP scaling range
B
Input (mA)
A
Set point
Upper limit value
changed from A to B
Set point
" (remote SP),
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