Rockwell Automation Publication ICSTT-RM448M-EN-P - February 2021 65
Chapter 4 Before You Begin
Estimating Center of
Gravity Information
If it is necessary to calculate the location of the center of gravity of an
AADvance controller destined for a maritime or other shock-mounted
application, it is reasonable to assume the center of gravity of each assembly of
modules and their base unit is at the geometric center of the assembly.
Design Considerations for Electrical Grounding
All applications of the controller will require at least two separate ground
(earth) systems:
• An AC safety ground (sometimes called the 'dirty ground') to protect
people in the event of a fault. The ground stud on the T9100 processor
base unit, and all exposed metalwork such as DIN rails, will be bonded to
the AC safety ground.
• An instrument ground (sometimes called the 'clean ground' or the
'0 Vdc ground') to provide a good stable 0 V reference for the system.
Every signal return will be referenced to the instrument ground. The
instrument ground will be isolated from the AC safety ground.
The AC safety ground and the instrument ground will usually be made
available through bus-bars. Bus-bars must be of copper; they may be nickel
plated. For a small application, you may use ground studs instead of bus-bars.
Some field wiring, such as communications cables, will need shielded
(screened) cable. There may be a shield ground, in addition to the AC safety
and instrument grounds, to provide a common point to terminate shields of
such cables. The shield ground will usually be connected to the AC safety
ground; or, more rarely, to the instrument ground. In practice, the continuity
of the shield connections will be more important than the goodness of the
ground connection provided.
Table 9 - AADvance Controller Module Weight
Item
Number
Used
Weight Allowance g
(oz.)
Subtotal
T9100 Processor Base Unit × 460 g (16 oz.)
T9110 Processor Module × 430 g (15 oz.)
T9401 Digital input module, 24 Vdc, 8 channel × 280 g (10 oz.)
T9402 Digital input module, 24 Vdc, 16 channel × 340 g (12 oz.)
T9431 Analogue input module, 8 channel × 280 g (10 oz.)
T9432 Analogue input module, 16 channel × 340 g (12 oz.)
T9451 Digital output module, 24 Vdc, 8 channel × 340 g (12 oz.)
T9482 Analogue output module, 8 channel × 290 g (10.5 oz.)
T9300 I/O base unit (3 way) × 133 g (5 oz.)
T98x1 Simplex Termination assembly × 133 g (5 oz.)
T98x2 Dual Termination Assembly × 260 g (10 oz.)
T98x3 Triple Termination Assembly × 360 g (13 oz.)
T9310 Expansion cable assembly and 2 m cable × 670 g (24 oz.)
T9841 Termination Assemblies (average weight) × 175 g (6 oz.)
Total estimated controller weight
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