Rockwell Automation 1771-QC , D17716.5.25 SER/B SERVO POS - Manual (Page 51)

Chapter
6
6Ć1
Installing the Assembly
The previous chapter described the hardware of the servo positioning
assembly. This chapter tells you how to install the servo positioning
assembly. As you install it, you will make hardware selections to direct its
operation to fit your application requirements.
The first step of installing a servo positioning assembly is to plan how to
configure modules in the I/O chassis.
Planning Module Combinations
You can install one 1771-M3 controller in an I/O chassis together with
either one, two, or three 1771-ES expanders. However, the I/O chassis
must not contain any other module combination of a master (such as an
analog module) and its slave (expander).
A master must communicate with its slaves through the backplane. Two
masters trying to communicate through the backplane interferes with each
other.
If you have an illegal combination of 1771-ES expanders or a second
master/slave combination in the I/O chassis, the active indicator on the
1771-M3 controller blinks. An illegal combination of 1771-ES expanders
would be:
the number of 1771-ES expanders not matching the number of axes in
the parameter block
an axis 2 with no axis 1
an axis 3 with no axis 2
two axes with the same number
Always use the same series level of 1771-M3 controller and 1771-ES
expander. You cannot use a series A 1771-M3 controller with a series B
1771-ES expander. Likewise, you cannot use a series B 1771-M3
controller with a series A 1771-ES expander.
Chapter Objectives
Configuring the Modules