User Manual

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Siemens TX-I/O Engineering and installation guide CM110562en_13
Building Technologies Control panel 2019-05-15
5.2.2 Grouping and order of modules
Criteria for the order of the I/O modules and the division into groups:
• Internal / external
– Outputs inside the control panel
e.g. connections to starters for motor control
– Outputs outside the control panel
e.g. direct wiring to field devices such as sensors, transmitters, control
equipment etc.
• Arranged in ascending order of module address.
• Grouped by DI, AI, AO, DO
• One "aggregate" (functional unit) after another
• Order based on voltage type:
– AC 230 V mains voltage
– Low voltage AC 24 V
• Plant-specific order:
e.g. based on the functions of the individual control loops (I/O modules for sensors,
transmitters and control equipment, control loop by control loop)
Other possible layout criteria:
• Country-specific regulations
• In-house conventions
5.2.3 Space requirements
The space required in the control panel can be calculated as follows:
• Number of I/O modules x 63 mm
• Bus interface module: 1 x 128 mm per I/O island
• Number of power supply modules x 96 mm
• Number of bus connection modules x 32 mm
• Automation stations
• Transformers
• Terminal strips
Free access to connection terminals is required for connection and inspection.
We recommend at least 30 mm clearance between the module and the trunking.
This results in the following distance between standard mounting rails/trunking:
90 mm (module width) + (b = width of trunking) + 2 x ≥30 mm (space for wiring)
Hardware list
Observe clearance
requirements!