UTMC OTU/MOVA Handbook
667/HB/31601/000
Page 21
Issue 5
3.5 ISOLATED OUTPUTS
Outstation cards are each equipped with a number of relay isolated outputs, two
change-over contacts on the Processor card and 16 change-over contacts on a Generic
IO card. The following describes the electrical characteristics of these outputs:
Processor card
Output
BUS/MOVA IO
Card Output
“On” Output
Impedance
182 1%, 0.1
Watts
182 1%, 0.1
Watts
“Off” Output
Impedance
100k min.
100k min.
Continuous
Current Sink
50mA
†
50mA
†
Breakdown
Voltage
1500V
1500V
Isolated Voltage
1500V
1500V
Relay Type
Change-Over
Change-Over
Notes:
†
The continuous current sink is limited by the resistors.
3.6 DIGITAL INPUTS
The Processor card supports 8 x TR2523 (TR0141) compliant digital inputs.
Each BUS/MOVA IO Card supports 48 x TR2523 (TR0141) compliant digital inputs.
These digital inputs have the following input electrical characteristics:
Processor
card Inputs
BUS/MOVA IO
Card Inputs
Input Impedance
4300 *
4300 *
“Off” Threshold
> 50k
> 50k
“On” Threshold
< 600
< 600
Absolute Max. Voltage
+1kV / -7V
+1kV / -7V
Isolation Voltage
n/a
n/a
* Referenced to 13.8V
3.7 COMMUNICATIONS
The Processor card has three serial RS232 and one Ethernet communication port. The
serial interfaces are software programmable in terms of their transmission
characteristic. The three RS232 and the single Ethernet communications interfaces are
shown on 667/GA/32600/000 in Appendix A and listed in the following sections.
The RS485 interfaces on the I/O card are not used by UTMC OTU.