(2)
PN-114277
DIR 10000060088
(Version 01)
Publication 1492-IN035B-EN-E
II. Installation
The 1492 Conversion Modules must be installed in a 1492 Conversion Mounting Assembly (see Table 1 below). A
complete System Installation Manual ships with the 1492 Conversion Mounting Assembly.
1) Determine the quantity of each type of 1771 I/O modules used in the 1771 I/O Chassis to be converted.
2) Select the applicable 1492 Conversion Modules from Table 2, Section III.
3) Review the Max Slots for I/O and Chassis Width data from the Table 1 below.
4) Select a 1756 I/O Chassis which has enough I/O Slots.
NOTE: (2) I/O slots are required in the 1756 Chassis for conversions where (1) 1771 I/O module converts to (2) 1756 I/O
modules.
5) Select the 1492 Conversion Mounting Assembly which has enough Conversion Module slots.
NOTE: (2) Conversion Module slots are required in the 1492 Conversion Mounting Assembly for conversions where (2)
1771 I/O module convert to (1) 1756 I/O modules.
NOTE: The 1492 Conversion Mounting Assembly has the same Height & Width foot-print as the 1771 Chassis and is
designed to use the same mounting hardware. The combined Depth of the 1492 Conversion Mounting Assembly with the
1756 Chassis mounted on top is 10.25 inches (Controller w/key) or 10.0 inches (Controller w/o key). Dimension drawings
are included in the System Installation Manual that ships with the 1492 Conversion Mounting Assembly.
Foot Notes:
1771-A3B is not listed as it is used for 19 inch wide instrumentation panels.
Notice that the 1756 Chassis Width sometimes exceeds the 1771 Chassis Width, with or without the Power
Supply. The Cover-Plate of the 1492 Conversion Mounting Assembly allows the 1756 Chassis to be Left justified,
Right justified or Centered. A complete System Installation Manual ships with the 1492 Conversion Mounting
Assembly.
1771 Chassis
1756 Chassis
Conversion Mounting Assembly
Chassis Width
Cat. No.
Max
Slots
for
I/O
without
Power
Supply
with
Power
Supply
Cat. No.
Max
Slots
for
I/O
Chassis
Width
Cat. No.
Max Slots
for
Conversion
Modules
Chassis
Width
1756-A4
3 10.35
1771-A1B 4 9.01
12.61
1756-A7
6 14.49
1492-MUA1B-A4-A7 4 9.01
1756-A7
6 14.49
1771-A2B 8 14.01
17.61
1756-A10
9 19.02
1492-MUA2B-A7-A10 8 14.01
1756-A10
9 19.02
1771-A3B1
12
19.01
1756-A13
12 23.15
1492-MUA3-A10-A13 12 19.01
1756-A13
12 23.15
1771-A4B 16
24.01
1756-A17
16 29.06
1492-MUA4-A13-A17 16 24.01
Table 1: Bulletin 1771 to 1756 Chassis Conversion