Flowmetering Flowmetering ancillaries 3
Technical data for the M850 series flow computers (continued)
Binary outputs (M850-W-x and M850-W-x-UL)
Number of outputs
4
Type of outputs
3 pole (COM, NO, NC) electromechanical relay
Contact rating (resistive load)
3 A at 85 .. 250 Vac / 30 Vdc
Maximum switching voltage
250 Vac / 125 Vdc Binary outputs (M850-P-x)
Number of outputs
4
Type of outputs
2 pole Solid State Relay
Contact rating (resistive load)
0.1 A at 24 Vac/dc (max 42 Vac 60 Vdc) / SELV
3.5 5
Maximum ON resistance
20 Ω
Galvanic isolation (optoisolation)
250 VAC continuous; 1 500 Vac for 1 minute
RS-485 / RS-422
Transmission protocol
ASC II , Modbus RTU, BACnet MSTP, GSM
Number of nodes in network
256
Maximum line length
1 200 m (depends on quality of data cable and baud rate)
Baud rate
2.4, 4.8, 9.6, 19.2, 38.4, 57.6, 115.2, 230.4 kbps
Parity control
Even, Odd, None
Frame
1 start bit, 8 data bits, parity 1 bit, 1 stop bit
Internal terminating resistor
Yes, activated with DIP switch
Maximum bus terminal voltages
-8 V … +13 V / SELV
Minimal driver differential output voltage
L = 54 W )
1.5 V (for R
Minimum receiver sensitivity
200 mV
Short-circuit / thermal protection
Yes
Galvanic isolation to Analog Inputs, Analog Outputs, Ethernet
250 Vac continuous; 1 500 Vac for 1 minute
Technical data for the M850 series flow computers continued on next page
TI-P333-29 EMM Issue 5
Page 5 of 10
M850-W and M850-P Flow Computers
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