Using The Optional Field Wiring Connector; Guidelines For Ac Installation; Guidelines For Dc Installation - Siemens Simatic S7-200 CPU 210 System Manual

Installing the S7-200 CPU 210

Using the Optional Field Wiring Connector

The optional field wiring fan-out connector (Figure 1-10) allows for field wiring connections to
remain fixed when you remove and re-install the CPU 210. Refer to Appendix F for the order
number.
Figure 1-10 Optional Field Wiring Connector

Guidelines for AC Installation

The following items are general wiring guidelines for AC installations. Refer to Figure 1-11.
Provide a single disconnect switch (A) that removes power from the CPU, all input
circuits, and all output (load) circuits.
Provide overcurrent devices (B) to protect the CPU power supply, the output points, and
the input points. You can also fuse each output point individually for greater protection.
External overcurrent protection for input points is not required when you use the 24 VDC
sensor supply (C) from the CPU 210. This sensor supply is short-circuit protected.
Connect all CPU 210 ground terminals to the closest available earth ground (D) to
provide the highest level of noise immunity. It is recommended that all ground terminals
be connected to a single electrical point. Use 14 AWG or 1.5 mm
connection.
If required, you can use a DC Sensor Supply from the CPU 210 to supply power for the
inputs (E). Refer to the guidelines for DC installation, especially in regard to connecting and
external power supply in parallel with the power supply of the CPU 210.

Guidelines for DC Installation

The following items are general wiring guidelines for isolated DC installations. Refer to
Figure 1-11.
Provide a single disconnect switch (1) that removes power from the CPU, all input
circuits, and all output (load) circuits.
Provide overcurrent devices to protect the CPU power supply (2), the output points (3),
and the input points (4). You can also fuse each output point individually for greater
protection. External overcurrent protection for input points is not required when you use
the 24 VDC sensor supply from the CPU 210. This sensor supply is internally current
limited.
Ensure that the DC power supply has sufficient surge capacity to maintain voltage during
sudden load changes. External capacitance (5) may be required.
1-10
DC
M L+ 0.0 0.1 0.2 0.3 M
OUTPUTS
Field Wiring
Fan-out Connector
L+ 24V DC
2
wire for this
S7-200 Programmable Controller, CPU 210
C79000-G7076-C235-01