Micromod RetroPAK: MOD 30 Installation Manual - Manual (Page 16)

MOD 30ML Replacement for MOD 30 Instruments
REPLACEMENT CONSIDERATIONS
2.2 COMMUNICATIONS AND I/O SIGNALS
2.2.1 COMMUNICATIONS
A built-in communications circuit supports either the RS-232 port in the front panel or
communication over the ICN. If the built-in circuit is used for the RS-232 port, an ICN
module must be installed to support ICN communication. The communication options
are selected by positioning two jumpers. Specific instructions for locating the jumpers
are provided in Section 3.4.
Selection of the jumper positions is based on one of the following requirements:
• Both ICN and RS-232 communication is required - The jumpers are located to
provide modular ICN communication, and RS-232 communication via the built-in
circuit. A 2030N ICN Communications module must be installed in module
locations S7 and S8 to support the ICN. Note that use of this module reduces the
number of I/O signals which can be accepted as shown in Tables 2-2 and 2-3.
• Only ICN communication is required - The jumpers are located to provide ICN
communication via the built-in circuit. Installation of an ICN module is not required.
The RS-232 port is not active.
• Only RS-232 communication is required - The jumpers are located to provide RS-
232 communication via the built-in circuit. Installation of an ICN module is not
required because the ICN is not being used.
2.2.2 I/O Signal Availability
The I/O points available in the replacement instrument are distributed between built-in and
modular circuits as follows:
• Built-in circuits provide 4 points; 2 analog inputs, 2 analog outputs.
• I/O Modules provide the following points:
- 3 module locations are dedicated to digital input numbers 1, 2, and 3.
- 4 module locations are dedicated to digital output numbers 1, 2, 3, and 4.
- When the built-in communications circuit is used for the ICN, 4 module locations
can be used for analog inputs, digital inputs or digital outputs on a shared basis.
- When a communications module is used for the ICN, 2 module locations can be
used for analog inputs, digital inputs or digital outputs on a shared basis.
The MOD 30 I/O signals which are assigned to a specific I/O module or built-in circuit are
identified in Table 2-1. The signals which share assignment to an I/O module location with
1 or 2 other signals are as identified in Tables 2-2 and 2-3. The user must select one
shared signal for each module depending on the requirements of the application. As
shown in Table 2-3, the modules available to accept shared signals is reduced when an
ICN module is used.
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