Micromod MOD: 30ML Installation - Manual (Page 28)

MOD 30ML Multiloop Controller
MECHANICAL INSTALLATION
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2.3 INSTALLING MODULES
The controller can accommodate as many as eleven I/O modules. These optional plug-in
modules expand the built-in I/O capacity of the controller. An optional memory module is
also available. The I/O modules mount on the carrier board, and the memory module mounts
on the CPU board as shown in Figure 1-1. The modules must be installed before placing the
controller into operation.
2.3.1 I/O Module Planning
In general, there is a high degree of flexibility in locating the I/O modules. The only specific
location restrictions are as follows:
 Field I/O circuits for locations S7 through S11 must not operate at voltages above 30V
rms, 42.4V peak, or 60V dc to comply with safety approval/certification requirements.
 Communications modules have a dedicated location determined by the communications
port being used.
 Special attention should be given to the 2003A current output and the 2012A active
current input modules to ensure adequate air flow for heat dissipation. It is
recommended they be installed in a slot that has no module in either adjacent slot, or in
slot 11 as long as slot 10 is not a 2003A or a 2012A. If installing these modules without
recommended spacing, it may be necessary to install fans in the cabinet or panel to
maintain temperatures below the maximum ambient operating limit. Refer to the
Mounting section of this manual for details.
 To guarantee the accuracy of the built-in cold junction compensator, when used, there
should be no module in slots 1 or 2 and no 2003A or 2012A in slots 3, 4 or 11.
Table 2-1 lists the available I/O module types, their associated data base memory block
identifications, and the valid locations for each module type. An I/O planning form is provided
to document the planned I/O configuration. An example of the form, listing built-in I/O
assignments and the module layout for a controller with five I/O modules, is shown in Figure
2-1. See Appendix A for a blank copy of all planning forms.
WARNING
Do not use any I/O module which is not listed in Table 2-1. When used
in MOD 30ML systems, the listed modules are FM Approved and CSA
Certified for use in Class I, Division 2, Group A, B, C or D hazardous
(classified) locations. Substitution of a module not on the list voids the
Approval/Certification.
Some other factors which influence I/O module requirements are as follows:
 If the controller requires thermocouple inputs, the first thermocouple should be connected
to built-in input 1 to provide automatic cold junction compensation for all inputs. If
automatic cold junction compensation is not enabled, an I/O module must be installed to
provide the compensation. See Section 4.3.1 for more information.
 The layout of module locations on the carrier board, Figure 2-1, divides locations 1
through 10 into pairs allowing double-wide modules to occupy only five different
locations.
 Communications port 1 serves either the built-in communications circuits or module
location S10 (S10 and S9 if module is double-wide). If the communications function is
being used, connections should first be made to the built-in communication circuit. This
leaves module locations S9 and S10 available for other I/O functions. Location S8 (S8
and S7 if module is double-wide) is always available for communications via port 2. See
Section 5 for more information.