eWON General Reference Guide - eWON wiki

5.10.2.2.1 ENERGY TAGS
The following tags are available for energy management:
LI1..LI8 Latched input
General Reference Guide IO Servers Configuration
Figure 101: eWON IO server default parameters
REM1: Energy tags are logged after each new period IF Logging is enabled, even if the value has not changed since previous period.
REM2: Even if Deadband is -1 and Interval is 0. If not, you will have additional points and even maybe duplicate points.
(*) Important: To avoid loss of precision due to Integer to float conversion, choose the right storage DataType for your Tag.
See "DataType of Tags" on page 75
5.10.2.2.2 32 BIT COUNTER TAGS:
When the Integration Period expires, the number of pulses counted during the integration
period are logged in the corresponding LIx.
ST1..ST4 Status variables:
ST1 This is the absolute time when counter were latched.
Expressed in seconds since 1/1/1970 minus 0x30000000 HEX (or 805306368 decimal).
Latch time - 0x30000000
This huge value is substracted to maintain precision in the Float storage. (*)
ST2
Period status
ST3
Period length sec
ST4
Period Num
0 means period is valid (within tolerance), 1 means period is invalid.
Length of the period in second.
This 32 bit counter counts is increased by 1 after each integration period. It can be used with
ONCHANGE to perform operations when period expires.
The eWON IO Server provides 8 32 bits (*) counter tags named: CI1..CI8. These counters are writable but writing in these registers affects the
LIx inputs of the Energy IO server module.
(*) Important: To avoid loss of precision due to Integer to float conversion, choose the right storage DataType for your Tag.
See "DataType of Tags" on page 75
RG-001-0-EN ver 1.14 eWON® - 02/05/2012 - ©eWON sa Page 130