Binary Output Module (Bom) - ABB REC 561 User Manual

1MRK 580 148-XEN
Page 2 - 34
2.6.3 Binary output
module (BOM)
Construction and hardware
characteristics - REC 561
monitoring and evaluation of operation for the terminal and for all associ-
ated electrical circuits. You can select the voltage level of the Binary input
modules (RL24, 48, 110, or 220) at order.
The design of all binary inputs enables the burn off of the oxide of the
relay contact connected to the input, despite the low, steady-state power
consumption, which is shown in Fig. 5.
Approx. current
in mA
30
1
Fig. 5 Current through the relay contact.
The Binary output module has either 24 single-output relays or 12 com-
mand-output relays (programmable). The relays are grouped together as
can be seen in the terminal diagram. The output relays have contacts with
a high switching capacity (Trip and signal relays).
Two single-output relays can be connected in series (which gives a com-
mand-output relay), in order to get a high security at operation of high-
voltage apparatuses.
The output relays are provided with a supervision function to ensure a
high degree of security against unwanted operation. The status of the out-
put contacts (on/off) is continuously read back and compared with the
expected status. If any discrepancy occurs, an error is reported. This func-
tion covers:
• Interrupt or short-cirucuit in an output relay coil.
• Failure of an output relay driver.
For more information about IOM, BIM and BOM, see: Requirements and
basic technical data - REC 561, (1MRK 000 147-XEN).
ABB Network Partner AB
Incoming pulse
10 ms
Version 1.0-00
Time
20 ms
(X80148-5)