System information

General Reference Guide eWON Configuration
RG-001-0-EN ver 1.5 eWON® - 20/03/2009 - ©ACT'L sa Page 73
Tag Visibility
Published value
Modbus TCP visibility
Each Tag in the eWON can be accessed by a modbus TCP master. If the Tag must be visible: Enable
this checkbox.
Register
Address of the register, starting with 1.
Only the register address has to be specified, the type of Tag (coil, contact, Input register or Holding
register) is obtained from the Tag type (Analog or Boolean) and the Tag Read Only or Read/Write
property (obtained from the IO server).
Consider as float
If this option is checked, then 2 consecutive 16 bits registers will be reserved and the value will be output
as a 4 bytes IEEE float in those 2 registers (standard Modbus float representation).
If the Tag is published as integer it may need to be scaled to fit the 16 bits modbus register. This
operation will be applied to the Tag value to publish it.
SNMP Visibility
If this is checked, the Tag can be seen by the SNMP manager. The OID of the Tag can be defined. The
base OID is already defined, the only parameter is the end of the OID.
Instant Value
Instant value means values of Tags at a given time.
The Tag's instant values are stored in the inst_val file (available in txt and binary format from the Files
Transfer link from the Main menu navigation bar from eWON). The 4 checkboxes that match the groups
that you want to choose will work accordingly to the $ft Export Block Descriptor Tag that is described in
chapter “$dtIV [Instant Values]” on page 183 in this manual. You will find there detailed information about
Instant Value too.
Table 45: Tag visibility controls
Alarm Setup
‘Alarm Enabled’
Check Box
Check if you want to generate an alarm on the current Tag name.
Alarm level low Low "warning" threshold value for alarm detection.
Alarm level high High "warning" threshold value for alarm detection.
Alarm level lowlow Low "danger" threshold value for alarm detection.
Alarm level hihi High "danger" threshold value for alarm detection.
Value Dead band
The dead band is the difference between the alarm level and the RTN level (Return To Normal).
e.g. if the alarm value is 20°C with a DeadBand=1, the alarm is triggered when the Temperature crosses
this 20°C boundary. On the other hand, the AlarmStatus will be RTN when the temperature passes below
19°C (20-1).
Boolean Alarm level The alarm value ('0' or '1') of a Boolean Tag name –not applicable for analog Tag name-.
Activation delay
Time in seconds for which the Tag has to be out of threshold before declaring the Tag is in an alarm
state. (This is mainly to avoid non significant alarms)
Auto acknowledge
If checked, the alarm will be automatically acknowledged when the alarm state goes to RTN value. Thus,
the alarm is directly ended.
Alarm Hint Information related to the alarm action - This Information will be included on the alarm email-
Table 46: alarm setup configuration controls