Emerson Process Management ControlWave EFM 3808 - Manual (Page 31)

CI-ControlWave EFM Introduction / 1-15
1.3.4 ControlWave EFM Backplanes
4-Slot or 8-Slot ControlWave EFM Backplanes provide for the electrical interconnection of
the System Controller Module (SCM), CPU Module, Expansion Communication Modules
(ECOMs) and/or I/O Modules. One or two Expansion Comm. Modules may be substituted
for I/O Modules in Backplane slots 3 & 4. Backplane module slot connections that support
Expansion Comm. Modules (slots 3 & 4) or I/O Modules (slots 3 through 8) are implemented
via 36-pin female Headers.
The main complement of signals on the Backplane, implement an I/O bus for data transfer
between the CPU and I/O Modules. Note: I/O Modules are Non Interrupt Capable.
+3.3Vdc and GND from the SCM are connected to the CPU. All I/O Module slot positions
receive +3.3Vdc and GND. Additionally, the SCM supplies switched field power
(FIELDVOUT) to all I/O Module slots. The power supply sequencer circuit (within the
SCM) provides POWERGOOD, POWERFAIL, VIN100M and PFDLYCLK signals to the
CPU thus providing properly timed early warning of low input or supply voltages followed
by a CPU reset to support the WARM START CPU function.
Figure 1-7 - Backplane Board Diagram
1.3.5 ControlWave EFM Base Assembly Chassis
A Gold Irridite Aluminum Chassis supports the ControlWave EFM Backplane PCBs and
the modules that comprise the system (see Figs. 1-3 & 4-3). Dimensions are provided in
Section 4 of this manual (see Figures 4-3 and 4-4 for 4-Slot and 8-Slot Chassis,
respectively).