Alstom iSTAT M355, Manual, Page: 61 / 154

User Manual M3x5/EN M/B
iSTAT M3x5
Page 59

Always switched on / off (permanent) – A relay is permanently switched on or off
irrespective of the condition for the alarm (general purpose digital output functionality).
For more information on Alarms see section 10.13.
10.10.3 Pulse Output Module (KD)
The pulse output module is either defined to an Energy counter or it can be used as an alarm
output with limited current load (max 20mA).
When used as a pulse output the number of pulses per energy unit, pulse length and the
tariffs in which the output is active are set.
Pulse parameters are defined in EN 62053-31, and the following is a simplified rule that
satisfies the specification, where ‘e’ is multiplier.
eWh 1 p 100 eW 15 5 , 1


Examples
Expected power  Pulse output settings
150 − 1500 kW  1 p/1kWh
1,5 − 15 MW  100 p/1MWh
15 − 150 MW  10 p/1MWh
150 − 1500 MW

1 p/1MWh
10.10.4 Tariff input module
There are no settings for the tariff input; they operate by setting the active tariff. With two
tariff inputs available a maximum of 4 tariffs can be selected.
Signal presence on tariff input Active tariff
Input T1/T2 Input T3/T4
Tariff 1 0 0
Tariff 2 1 0
Tariff 3 0 1
Tariff 4 1 1
10.10.5 Digital Input module
Purpose is to collect digital signals from various devices, such as intrusion detection relay,
different digital signals in transformer station, industry etc.
There are no settings for the digital input; they operate by acting as an input to the Alarms 1
to 32. The input therefore can be used to trigger a software alarm and is available via the
communications and can be stored in the alarm data recorder.