Micromod RetroPAK: MOD 30 Installation Manual - Manual (Page 18)

MOD 30ML Replacement for MOD 30 Instruments
REPLACEMENT CONSIDERATIONS
2.2.3 I/O Signal Specification Differences
In general the specifications for the replacement instrument are compatible with the MOD
30 instrument specifications. The following differences should be noted:
Specification MOD 30 Replacement
Current Requirements
Controller 0.55A max 0.63A max
Indicator 0.50A max 0.63A max
Math Unit 0.58A max 0.63A max
Digital input
High Level (Logic 1) 4.0V dc min 2.2V dc min
Low Level (Logic 0) 1.5V dc max 0.65V dc max
current load 3mA 2.5mA max
Digital Output
Voltage 30V dc max 24V dc max
Current 50mA max 100mA dc max
2.3 CONTROLLERS
The MOD 30 Controller and Controller XL require a single interconnecting cable to carry
power, ICN communication, and I/O signals between the instrument and the termination
panel. The replacement instrument uses this same cable. The full complement of 10 I/O
points and one communications point can be accommodated by the replacement
instrument. The controller I/O signals are as follows:
• 3 Analog Inputs
• 2 Analog Outputs
• 2 Digital Inputs
• 3 Digital Outputs
If the full I/O complement is required, the replacement instrument with factory installed I/O
modules (Catalog No. 1800RZ_ _ _2_A) should be used. The locations of the factory
installed modules, their catalog numbers, and I/O signals are shown on the planning form,
Figure 2-1. This form of the instrument simplifies the replacement procedure because the
user does not need to plan for and specify the required modules, and install the modules
when making the replacement.
If the full I/O complement is not required, the required I/O modules must be selected and
installed when making the replacement. Use the controller I/O module planning form to
record the selected modules and their locations. An example of the form filled in for a
controller having one digital input and 2 digital outputs is shown in Figure 2-1. Note that an
ICN communications module is specified so that both ICN and RS-232 communication are
supported (see Section 2.2.1). See Appendix A for a blank copy of the planning form.
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