GE 745 TRANSFORMER MANAGEMENT RELAY Instruction Manual page 310

8.5 POINT LISTS
POINT LIST FOR:
(Note 5) Index when
Point Mapping Is:
Disabled Enabled
67 187
68 188
69 189
70 190
71 191
72 192
Table Notes:
1. Unless otherwise specified, an event object will be generated for a point if the current value of the point changes by an
amount greater than or equal to two percent of its previous value.
2. An event object is created for these points if the current value of a point is in any way changed from its previous value.
3. An event object is created for the System Frequency point if the system frequency changes by 0.04 Hz or more from its
previous value.
4. The data returned by a read of the User Map Value points is determined by the values programmed into the corre-
sponding User Map Address registers (which are only accessible via Modbus). Refer to the section titled "Accessing
Data Via The User Map" in this chapter for more information. Changes in User Map Value points never generate event
objects. Because of the programmable nature of the user map, it cannot be determined at read time if the source value
is signed or unsigned. For this reason, the data returned in a 32-bit variation is never sign-extended even if the source
value is negative.
5. Depending upon the configuration and/or programming of the SR745, this value may not be available. Should this be
the case, a value of zero will be returned.
6. Points with format F78 and F93 are scaled based upon the value of the Winding 1 Phase CT Primary setpoint (point 0).
It is necessary to read point 0 and refer to the descriptions of these formats (in the "SR745 Data Formats" table) in
order to determine the scale factor.
7. As for note 6 except the affected formats are F79 & F94 and the scaling is determined by the value read from point 1.
8. As for note 6 except the affected formats are F80 & F95 and the scaling is determined by the value read from point 2.
9. As for note 6 except the affected format is F81 and the scaling is determined by the value read from point 3.
10. As for note 6 except the affected format is F82 and the scaling is determined by the value read from point 4.
11. As for note 6 except the affected format is F83 and the scaling is determined by the value read from point 5.
12. The "Total Accumulated Loss Of Life" is a 32-bit, unsigned, positive value. As a consequence, a master performing 16-
bit reads cannot be guaranteed to be able to read this point under all conditions. When this point's value exceeds
8
65535 (0xffff hex), a 16-bit read will return 0xffff (hex) and the over-range bit in the flag returned with the data will be
set. Because of this possibility of over-range, the default variation for this object is 2 (i.e., 16-bit analog input with flag).
13. There are two defined maps for Analog Output points. The map used is specified by the setting of the "Point Mapping"
setpoint at Modbus address 10D1 (hex). This setpoint may be set to a value of "Disabled" or "Enabled". When "Dis-
abled", only the preassigned Analog Output points are available at indices 0 through 72.
When "Enabled", the User Map Values are assigned to points 0 through 119 with the preassigned Analog Outputs following
beginning with point index 120. The value read from points 0 through 119 will depend upon the value programmed into the
corresponding User Map Address setpoint (note that programming of these setpoints can only be accomplished via Mod-
bus). Refer to the section in this chapter titled Accessing Data Via The User Map for more information.
Please note that changes in User Map Values never generate event objects.
8-100
ANALOG INPUT (OBJECT 30)
ANALOG INPUT CHANGE (OBJECT 32) (Continued)
Format Description
F94 Winding 2 Apparent Power
F3 Winding 2 Power Factor
F95 Winding 3 Real Power
F95 Winding 3 Reactive Power
F95 Winding 3 Apparent Power
F3 Winding 3 Power Factor
745 Transformer Management Relay
Event Class Notes
Assigned To
Class 1 Notes 5,7
Class 1 Note 5
Class 1 Note 5,8
Class 1 Note 5,8
Class 1 Note 5,8
Class 1 Note 5
GE Power Management