Mounting and installation
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3 Mounting and installation
3.1 General information
3.1.1 Functional grounding
All devices must be grounded so that the data telegram is shielded from any possible mal-
functions which can then be discharged to ground potential.
• Mount the 20xx/21xx/22xx/23xx/24xx/25xx versions on a grounded DIN rail. The
functional ground of the device is achieved when the module is snapped onto the
DIN rail. A conductor of at least 2.5 mm² must be used for functional grounding.
• For the 20xxF versions, grounding is implemented via the FE contact on the
COMBICON connector and a conductor of 1.5 mm².
• For IP67 versions 26xx/27xx, connect the conductor directly to the metal housing of the
device, e.g., at the mounting holes. For this, you can use M6 ring cable lugs in accor-
dance with DIN 46235 or DIN 46234 with a diameter of up to 10 mm. When mounting
the device with the base on a conductive surface, FE is connected via the mounting
screw. A conductor of at least 2.5 mm² must be used for functional grounding.
3.1.2 Assignment of the Ethernet connectors
3.1.2.1 RJ45 Ethernet connector
Grounding protects people and machines against hazardous voltages. To avoid these
dangers to the greatest extent possible, correct grounding, taking the local conditions into
account, is vital.
Only devices in the 21xx/23xx/25xx versions support Gigabit.
Please note: For operation with 1000 Mbps (Gigabit), cables with four twisted pairs
(eight wires), which meet the requirements of CAT5e as a minimum, must be used.
Table 3-1 Pin assignment of RJ45 connectors
Pin number 10Base-T (10 Mbps) 100Base-T (100 Mbps) 1000Base-T (1000 Mbps)
1 TD+ (transmit) TD+ (transmit) BI_DA+ (bidirectional)
2 TD- (transmit) TD- (transmit) BI_DA- (bidirectional)
3 RD+ (receive) RD+ (receive) BI_DB+ (bidirectional)
4 - - BI_DC+ (bidirectional)
5 - - BI_DC- (bidirectional)
6 RD- (receive) RD- (receive) BI_DB- (bidirectional)
7 - - BI_DD+ (bidirectional)
8 - - BI_DD- (bidirectional)
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