Sel 751A - Page 185

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Date Code 20100129 Instruction Manual SEL-751A Relay
Protection and Logic Functions
Global Settings (SET G Command)
Set EMP to enable the desired number of message points.
Set each of MPTRxx (xx = 01–32) to the desired Relay Word bits, the rising
edge of which defines the trigger condition.
MPAQxx is an optional setting and can be used to specify an Analog Quantity
to be formatted into a single message as described next.
Use MPTXxx to construct the desired message. Note that by default the analog
quantity value, if specified, will be added at the end of the message, rounded
to the nearest integer value (see Example 4.21).
EXAMPLE 4.21 Setting MPTXxx Using the Default Location of
Analog Quantity
MPTX01 := THE LOAD CURRENT IS
MPAQ01 value = 157.44
Formatted message out when triggered: THE LOAD CURRENT IS 157
Location and resolution of the analog quantity value within the
message can be specified by using “%.pf”,
where
% defines location of the value
p defines number of digits (up to 6, defaults to 6 if omitted)
f indicates floating point value (use %d if nearest whole
number is desired)
EXAMPLE 4.22 Setting MPTXxx With a Specified Location of
Analog Quantity
MPTX01 := THE LOAD CURRENT IS %.2f AMPERES
MPAQ01 value = 157.44
Formatted message out when triggered: THE LOAD CURRENT IS
157.44 AMPERES
MPTX01 := THE LOAD CURRENT IS %d AMPERES
MPAQ01 value = 157.44
Formatted message out when triggered: THE LOAD CURRENT IS 157
AMPERES
MESSENGER POINT
MP01 TEXT
148 characters MPTX01 :=
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MESSENGER POINT
MP32 TRIGGER
Off, 1 Relay Word bit MPTR32 := OFF
MESSENGER POINT
MP32 AQ
None, 1 analog quantity MPAQ32 := NONE
MESSENGER POINT
MP32 TEXT
148 characters MPTX32 :=
Table 4.40 Event Messenger Settings (Sheet 2 of 2)
Setting Prompt Setting Range
Setting Name :=
Facto ry Default