HARDWARE MANUAL Document reference MAMPS-HW/E
VM600 machinery protection system (MPS) Edition 18 - March 2022
10 - 14
DSI control inputs (DB, AR)
CONFIGURATION OF AMC8 / IOC8T CARDS
10.5DSI control inputs (DB, AR)
These DSI control inputs are normally floating (open circuit).
To activate a function, connect the appropriate “Input” and “Return” terminals together to
close the contact.
The inputs function as follows:
• Danger Bypass (DB): A closed contact between the DB Input and DB Return terminals
allows the operator to inhibit the danger relay outputs.
DB Input = Connector J3, Terminal 19
DB Return = Connector J3, Terminal 20.
• Alarm Reset (AR): A closed contact between the AR Input and AR Return terminals
resets latched alarms.
AR Input = Connector J3, Terminal 17
AR Return = Connector J3, Terminal 18.
NOTE: An externally generated Alarm Reset (AR) should be an aperiodic pulse-type
signal, that is, it should not be activated continuously.
For further information on the Danger Bypass function, see 4.6.5 Danger Bypass function.
10.6Channel inhibit function
The channel inhibit function can only be activated using software, that is, there is no
equivalent DSI input.
The channel inhibit function is activated when one of the VM600 MPSx software packages
(MPS1 or MPS2) is used to send channel inhibit commands to individual AMC8 channels
(Communications > To AMC > Channel Inhibits).
Alternatively, Modbus can be used to control the channel inhibit function for a networked
VM600 machinery protection system (containing a CPUM card).
For further information on the channel inhibit function, see 5.8.4 Channel inhibit function.
10.7Slot number coding for IOC8T cards
IOC8T cards use an electronic keying mechanism to help prevent them from being installed
in the wrong slot of a VM600 rack. Each IOC8T card has a bank of micro-switches that are
used to assign a slot number to the card, stored in the slot number (address) assignation
register.
The IOC8T card compares its slot number with the rack’s slot number (see Figure 2-2). The
result of the comparison is displayed on the SLOT ERROR LED on the cards panel:
• If the codes are identical, the LED is green.
• If the codes are not identical, the LED is red.
10.7.1 VM600 system rack (ABE04x)
When an IOC8T card is installed in a VM600 system rack (ABE04x), the micro-switches on
the card must be configured to match the rack slot (slot number) being used (see 2.1.1.1 Slot
number coding for cards in the rear of a VM600 system rack).
The example in Figure 10-10 shows the micro-switch settings required for an IOC8T card
installed in slot 11 of a VM600 system rack.
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