Connecting
5.4 Add-on output and input modules
Possible combinations / functions of output pulses
● Energy pulse output (default function for output A)
Pulse value: depending on last digit of energy display unit
● Volume pulse output (default function for output B)
Pulse value: depending on last digit of volume display unit
Example:
Display unit
Pulse value
MWh with 1 decimal place (default)
100 kWh/Pulse (0.1 MWh/Pulse)
m
3
with 1 decimal place (default)
100 L/Pulse
● Tariff energy 1 and Tariff energy 2
Pulse value: depending on display unit last digit in display
● Tariff condition 1 or/and Tariff condition 2, (level switch)
Output as static state for each new determination of tariff condition e.g. flow rate ≥ 100 m
3
/h
or/and temperature difference < 50°C
1.
Signal input A: terminal A and ⊥ (ground)
2.
Signal input B: terminal B and ⊥ (ground)
- External power supply: VCC = 3 ... 30 V DC
- Output current: max. 20 mA with a residual voltage of 0.5 V
- Output type: Open collector (drain)
- Max. output frequency: 4 Hz
- Pulse length: typically 125 ms ± 10 ms
- Pulse break: ≥ 125 ms ± 10 ms
- Connections for 2 x 2.5 mm
2
wires (shielded cable is recommended)
M-Bus communication module
The optional M-Bus communication module is a serial interface for communication via M-Bus
protocol (according to EN1434 standard) with external devices (e.g. M-Bus controlling centre
like a M-Bus-repeater or M-Bus-master). A number of heat meters can be connected to a
control centre.
The board contains 2 terminals marked as 24 and 25, which are typically connected to the
M-Bus master (M-Bus controlling centre).
Figure 5-6
M-Bus module
SITRANS FUE950
Operating Instructions, 01/2010, SFIDK.PS.022.F4.02
31