Rockwell Automation MHB44IND Pulse Input and Analogue Output Module - Manual (Page 8)

8 MHB44IND October 2005 – Issue 2
Triguard SC300E
EXTERNAL CONNECTIONS
All connections to the MHB44IND are made via DIN 41612 connectors.
The upper connector is the system triple I/O bus connector. The middle connector is for the
field inputs and outputs. The lower connector is electrically in parallel with the middle
connector.
System interface
This MHB44IND acts as a slave to the MPP masters, and communication between three
MPPs and the MHB44IND takes place over the triplicated 16 bit parallel I/O - MPP buses that
run along the chassis mounted backplane. The three I/O - MPP buses are connected via the
module’s upper system interface DIN 41612 connector.
Field interface
The MHB44IND input, output and feedback connections are wired via one of the connectors (J2
or J3) to the termination card TPH44AIC.
Pulse inputs
Four isolated voltage inputs of 100mV to 150V peak to peak are provided.
Each pulse input channel has both its lines connected via 100k ohm resistors to the test jacks
and a front panel mounted LED flashes to indicate when pulses are being received.
Current loop outputs
Four 0 to 22mA with common return. The termination card has a precision resistor for each
channel to control the current. This allows two modules to be used for dual-slot hot repair
purposes using the same termination card.
CONFIGURATION LINKS
The module contains a hardware identity circuit that enables system identification of the
module, and seven manual configuration links, JP1 to JP4 and LK1, LK2 and LK3.
Links JP1 to JP4 and LK1 to LK3
Links JP1 to JP4 enable undercurrent and overcurrent monitoring from a special termination
card giving galvanically isolated outputs. Links JP1 to JP4 must beset to the Off position.
Links LK1 to LK3 are described in Section 2.6, Theory of operation.
POWER SUPPLIES
The MHB44IND operates from dual power inputs supplied by the system’s dual redundant
PSUs, that each supply voltages of approximately 5.4Vdc and 12Vdc.