Installing The Block I/O - AB Quality ALLEN-BRADLEY 1791 User Manual

When using
PLC 5 family (continued)
SLC 5/02 (and greater) S C /
Controller Controller
1
PLC 5/15 series A and PLC 5/15 series B prior to revision H (B/H) can only address 3 blocks.
2
PLC 5/25 revisions prior to A/D can only address 7 blocks.
3
Analog block is 1/2 rack in discrete transfer mode. If you combine analog block and discrete transfer on the same RIO link, the capacity ranges between 8 and 15 blocks.

Installing the Block I/O

Block
2.0 (50.8) air gap
on all 4 sides.
Operating temperature in
air gap below module must
o o
not exceed 60 C (140 F).
and
16 blocks/channel, 32
blocks/scanner, (128 blocks with 4 blocks/scanner (128 blocks with 4
scanners) with 150 ohm terminator
PLC 5/250 requires PLC 5/250 i
a 5150 RS remote scanner a 5 50 S e o e sca e
32 blocks/channel, 32 32 blocks/channel, 32
blocks/scanner, (128 blocks with 4
scanners) with 82 ohm terminator scanners) with 82 ohm terminator
and extended node addressing
8 blocks with 150 ohm terminator 8 blocks with 150 ohm terminator
1747 SN Remote I/O Scanner S /O S
Module (discrete mode only) Module (discrete mode only)
8 blocks with 82 ohm terminator
Figure 2.1 shows the mounting dimensions for the block I/O module.
Mount the blocks vertically with a minimum of 2" between blocks. This air
gap is necessary to maintain proper cooling air flow through the block.
Figure 2.1
Mounting Dimensions for the Block I/O Modules (1791 N4V2 shown)
0.5
(12.7)
6.95
(176.5)
(167.6)
Equipment
Grounding
Stud
CAUTION: When tightening grounding stud nut, do not exceed 15 in lbs.
Chapter 2
Installing Block I/O
Maximum Capacity
3 3
3
2.710
(68.8)
1.71
(43.4)
1791 N4V2
ANALOG BLOCK
1
OUTPUT
0
1
6.60
POWER
COMM
FAULT
INPUT
0
1
2
3
30
Baud Rate Maximum
Used Network Distance
57.6K 10,000 cable feet
115.2K 5,000 cable feet
57.6K 10,000 cable feet
115.2K 5,000 cable feet
230.4K 2,500 cable feet
57.6K 10,000 cable feet
115.2K 5,000 cable feet
230.4K 2,500 cable feet
Inches
(Millimeters)
6.95H x 2.710W x 3.85D
(176.5H x 68.8W x 98D)
2 mounting holes
for 1/4 inch screws
2-3