OPERATION MANUAL CompoBus/S

I/O Link Units for CPM1A and CPM2A Section 5-9
Slave Components The following diagram shows the main components of the CPM1A-SRT21 I/O
Link Unit for CPM1A/CPM2A. The functions of these components are
described below.
328
Expansion I/O Connecting Cable
(provided with this Unit)
Connect to the expansion
connector of the CMP1A/CPM2A
CPU Unit or the Expansion Unit.
DIP Switch
Open the cover to reveal the DIP switch. The DIP
switch's pins have the following functions:
Pins 1 to 4: Node number setting
Pin 5: Communications mode setting
Pin 6: Hold/Clear outputs for communications error
No.
COMM
ERR
BD H NC(BS+)
BD L NC(BS-)NC
CompoBus/S Indicators
Indicate the status of the Slave and
communications.
Expansion Connector
Open the cover to reveal the expansion
connector. Other Expansion Units for
CPM1A/CPM2A can be connected here.
DIN Track Mounting Hooks
Used when mounting the Unit to a DIN track.
Terminal Block
Used to connect CompoBus/S communications cable.
Shared communications and I/O terminals are not used.
Mounting Screw Holes
Used when screwing the Unit to a control panel.
Indicators
The following table shows the meaning of the indicators.
DIP Switch Always turn OFF the CPM1A or CPM2A CPU Unit before changing DIP switch
settings.
SRT21
EXP
Indicator Name Status Meaning
COMM
(yellow)
ERR
(red)
Communications ON Normal communications.
OFF A communications error has occurred or
the Unit is in standby status.
Communications
error
ON A communications error has occurred.
OFF Normal communications or the Unit is in
standby status.
Node Number Setting
Set the node number with pins 1 through 4, as shown in the following table.
Node number Pin 4
(8)
Node Address
Node number setting
Hold/Clear outputs for
communications error
Communications mode setting
Pin 3
(4)
Pin 2
(2)
0 OFF OFF OFF OFF
1 OFF OFF OFF ON
2 OFF OFF ON OFF
Pin 1
(1)