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265
Remote I/O Modules
Section 5-3
The 5-V output terminals have positive power supplies (maximum output cur-
rent of 20 mA) for the ERR and COMM LEDs. Recommended LED colors are
red for ERR and yellow for COMM.
Precautions on Inner-layer
Pattern Connecting BD H
and BD L Terminals
The pattern connecting terminals BD H and BD L should be as short and as
straight as possible. The following precautions should also be observed.
• Conductor Pattern Length
The length of the conductors in the pattern connecting the BD L and
BD H terminals of the terminal block to those of either SRT
@
-ID16P or
SRT
@
-OD16P (L
1
, L
2
) must satisfy the following conditions.
L
1
+ L
2
≤
10 cm
L
1
≈
L
2
(Within ratio of 1.5)
• Conductor Pattern Width
The width of the conductor in the pattern connecting the BD L and BD
H terminals of the terminal block to those of either SRT
@
-ID16P or
SRT
@
-OD16P must be sufficient to carry a current of 250 mA DC, and
must also not exceed 0.3 mm (0.3 mm recommended).
• Area Prohibited to Inner Layer Conductor Pattern
Do not create another conductor pattern within 10 mm of the pattern
connecting the BD L and BD H terminals of the terminal block to those
of either SRT
@
-ID16P or SRT
@
-OD16P.
Precautions on Crossing Conductors
When it is necessary for the conductors of the pattern connecting the BD L
and BD H terminals of the terminal block to those of either SRT
@
-ID16P or
SRT
@
-OD16P to cross, be sure to create one end on the soldered surface of
the circuit board, and make the conductors cross between the terminal block
and the SRT
@
-ID16P or SRT
@
-OD16P.
BD L
BD H
BD L
BD H
10 mm
10 mm
L
1
L
2
Area prohibited to inner
layer conductor pattern
SRT
@
-ID16P/OD16P
Terminal
block
SRT
(
-ID16P/OD16P
BD H
BD L
BD L
BD H
Terminal
block