Installation Instruction
s
About This Document
Use this document to install the 1784-PCM2/B cable. This cable
connects the 1784-PCMK/B card to a PLC-2 processor.
Verify Package Contents
Make sure that you have these items before you discard any
packing material.
Loopback Connector1784-PCM2/B Cable
Two Wedges
If
any item is missing or incorrect, contact
your local Allen-Bradley of
fice.
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1784-PCM2/B Cable2
Attach the Wedges
ATTENTION: You must attach the wedge that is
provided with your cable to the computer. This wedge
!
1. Slide the wedge into the slot on the bottom of the cable’s electronics
pod as shown below.
provides strain relief for the cable and secures the cable to
the computer so the cable is not accidently disconnected.
If you do not use the wedge and the cable disconnects, it
can damage the connector on the cable and PCMK card.
electronics pod
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2. Position the assembly on the computer so the narrow end of the
wedge is closest to the PCMCIA slot. When you find the best location
for the wedge, use a pencil to mark the location on the computer.
length of cable from
connector to electronics
pod is17.8 cm (7 in.)
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1784-PCM2/B Cable 3
3. Separate the wedge from the electronics pod.
4. Remove the paper backing from the wedge.
ATTENTION: The adhesive on the wedge is very strong.
Once you remove the protective paper and attach the
!
wedge to the computer, you cannot remove the wedge.
Be sure you are confident about the position of the wedge
before you secure it.
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5. Place the wedge on the computer where you marked the location.
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1784-PCM2/B Cable4
Connect the Cable
Important: When installing your 1784-PCM2/B cable, make sure you:
• securely attach the cable connector to the 1784-PCMK/B card (check
this connection if you are experiencing communication problems)
• use the wedges to support the weight of the pod
• do not bump the cable or connected hardware and inadvertently
disconnect the cable
Important: To run a loopback diagnostic test, you connect the
1784-PCM2/B cable to the PCMK card and connect the
loopback connector to the 1784-PCM2/B cable.
1. Slide the cable’s electronics pod onto the wedge on the computer.
2. Attach the cable to the PCMK card.
The silver side should
face the top of the card.
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3. Attach the cable to the processor.
1784-PCM2/B Cable 5
1784-PCM2/B
PLC-2
or Mini-PLC-2t
family programmable controller
PLC-2 or Mini-PLC-2
family programmable controller
ground wire
CN, -
1771-
1771-KE
1771-KF
1771-KG
1771-KGM
1771-KA2
1785-KA3
CO or -
CR
to RS-232, DH, DH+
1784-PCM2/B
ground
wire
t link
For grounding information, see the Industrial Automation Wiring and
Grounding Guidelines, publication 1770-4.1.
4. Verify that you can go online with the PCMK card and your
application software.
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1784-PCM2/B Cable6
Removing the Cable
If you need to remove the cable:
1. Verify all communication software has been stopped.
2. Remove the cable by gently pinching the side bars and pulling the
connector toward you.
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1784-PCM2/B Cable 7
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1784-PCM2/B Cable8
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