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12
Direct Communication Module
Chassis Size (SW2-5 and SW2-6)
The logical chassis size allocates image space in the scanner for each 1747-DCMs
I/O data. The 1747-DCM allows ¼, ½, ¾, and full chassis addressing. SW2 switches
5 and 6 define the chassis size, as shown below.
Chassis Size
¼ Logical Chassis
½ Logical Chassis
¾ Logical Chassis
Full Logical Chassis
IMPORTANT
Installation and Removal
ATTENTION
!
IMPORTANT
Power Requirements
Before installation, make sure your modular SLC power supply has adequate
reserve current capacity. The 1747-DCM requires 360 mA at 5V dc.
Each fixed SLC 500 controller can support one 1747-DCM in a 2-slot expansion
chassis, depending on which I/O module is in the second slot. See Discrete Input
and Output Modules Technical Data, publication number 1746-2.35 for details.
Publication 1747-IN005B-EN-P - March 2003
SW2-5
SW2-6
ON
ON
ON
OFF
OFF
ON
OFF
OFF
The 1747-DCM image cannot cross logical chassis boundaries. For
example, configuring the module for ½ logical chassis with
starting group 6 will cause a configuration error.
Disconnect power before attempting to install, remove, or wire
the 1747-DCM.
Make sure you have set the DIP switches properly before
installing the 1747-DCM. See Module Configuration on page 7.
Number of RIO Words Transferred
1 Status and 1 Data
1 Status and 3 Data
1 Status and 5 Data
1 Status and 7 Data
Total Words
2
4
6
8
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