58
Connection Method
Section 4-5
RS-422A Wiring
Note
(1) Ground the shield only to the host (PLC) to prevent malfunctions due to
ground potential differences.
(2) Recommended cables: TKVVBS4P-03 (100 m Tachii Electric Wire) or
AWG22 shielded cable.
Ground and Shield Wiring
Perform the following connections, shield wiring, and grounding in any com-
munications system using the Removable Box. Incorrect connections may
cause a host communications error.
•
Connecting the Removable Box D-Sub Connector
Be sure to fasten the screws on both sides of the D-Sub connector. If
these screws are not fastened, the NSH5 PT's functional ground terminal
and the Removable Box's FG will not be connected.
•
Ground Line Wiring
The Removable Box is equipped with a functional ground (
).
1. Normally, ground the Removable Box as shown in
Figure A
on the fol-
lowing page.
• Connect the ground terminals on all Units and the functional ground,
and ground the line at one location to 100
Ω
or less.
• Short the PLC's LG terminal and the GR terminal.
• The ground wire must be 2 mm
2
or larger.
• For detailed grounding instructions, refer to the operation manual for
the Communications Unit.
2. If a source of noise, such as a motor or inverter, is grounded to the same
panel, do not ground the Removable Box's functional ground terminal
(
), as shown in the
Figure B
.
•
RS-422A Cable Shield Wiring
Be sure to connect the shield on the RS-422A cable. If the shield is not
connected, a host communications error may occur.
When connecting the ground terminals on all Units and the functional
ground, and grounding the line at one location to 100
Ω
or less, connect
the shield only at one end of each line, as shown in
Figure A
.
If the Removable Box's functional ground terminal is not grounded, con-
nect the shield at both ends of each line, as shown in
Figure B
.
If a CJ1W-CIF11 is also connected in the system, connect the lines and
shield as shown in
Figure B
.
Name
SDB
SDA
RDB
RDA
Pin No.
RS-422A
Connector
RS-422A Terminal Block on
Removable Box
(8-pin terminal block)
Pin No.
RS-422A
Connector
PLC
Name
Shield ground terminal
SD+
SD
−
RD+
RD
−
(See note 1.)
Shield
Use twisted-pair wires for SDB and SDA, and for RDB and RDA.
Functional ground
8
3
4
1
2
(See
note 2.)
Summary of Contents for NSH5
Page 2: ......
Page 4: ...iv ...
Page 12: ...xii ...
Page 16: ...xvi ...
Page 24: ...xxiv EC Directives 6 ...
Page 58: ...34 Installing the Mounting Bracket Section 2 5 ...
Page 86: ...62 Connection Method Section 4 5 ...
Page 92: ...68 Precautions When Replacing the PT Section 5 4 ...
Page 98: ...74 General Specifications Appendix A ...
Page 99: ...75 Appendix B Dimensions 75 50 176 223 75 Four M4 70 5 16 5 ...
Page 102: ...78 Types of Memory Appendix C ...
Page 107: ...83 Recommended Enabling Circuits Appendix D Program Example ...
Page 108: ...84 Recommended Enabling Circuits Appendix D ...