Description

Wiring Method for S71201-NANANA

(Siemens S7-1200 Series PLC Variant)

1. Safety Precautions Before Wiring

Disconnect all power supplies (AC/DC) before starting wiring to prevent electric shock or component damage.
Use shielded twisted-pair cables for analog signals and communication lines to minimize electromagnetic interference (EMI).
Ensure proper grounding (PE) connection with a resistance ≤4Ω to guarantee system stability and safety.
Use an anti-static wristband when handling the PLC to avoid electrostatic discharge (ESD) damage to internal components.
Verify cable specifications (wire gauge, insulation rating) match the PLC’s electrical requirements before installation.

2. Power Supply Wiring

Terminal Label	Function	Wiring Requirements
L+	DC Power Input (Positive)	Connect to 24VDC power supply positive terminal (recommended wire gauge: 1.5mm² copper cable).
M	DC Power Input (Negative)	Connect to 24VDC power supply negative terminal (common ground with external devices).
PE	Protective Earth	Connect to the system’s protective earthing conductor (green-yellow cable, minimum 2.5mm² wire gauge).

Notes:

Input voltage range: 24VDC ±10% (unregulated power supply is acceptable; use a stabilized power supply for critical applications).
Do not reverse the polarity of L+ and M terminals—this will permanently damage the PLC.
Keep power cables separate from signal cables (minimum distance: 10cm) to avoid cross-interference.

3. Digital I/O Wiring

3.1 Digital Input (DI) Wiring

Terminal Label

Function

Wiring Requirements

DI0-DI15

Digital Input Channels

Supports NPN/PNP input type (configurable via software or DIP switch, if available).

– For NPN sensors: Connect sensor signal wire to DI terminal; sensor common to M terminal.

– For PNP sensors: Connect sensor signal wire to DI terminal; sensor common to L+ terminal.

– Recommended wire gauge: 0.5-1.0mm²; maximum cable length: 100m (shielded cable).

COM_DI

Common Terminal for DI

Shared common terminal for digital inputs (connect to corresponding sensor common terminal based on input type).

3.2 Digital Output (DO) Wiring

Terminal Label

Function

Wiring Requirements

DO0-DO15

Digital Output Channels

Supports transistor (PNP/NPN) or relay output (check PLC model for specific type):

– Transistor Output: Max load current per channel ≤0.5A; connect actuator to DO and corresponding COM_DO terminal.

– Relay Output: Max load current per channel ≤2A (250VAC/30VDC); suitable for high-power actuators.

– Recommended wire gauge: 0.75-1.5mm²; maximum cable length: 50m.

COM_DO1/COM_DO2

Common Terminals for DO

Grouped common terminals (e.g., COM_DO1 for DO0-DO7, COM_DO2 for DO8-DO15); connect to power supply common or load power terminal based on output type.

4. Analog I/O Wiring

Terminal Label

Function

Wiring Requirements

AI0+/AI0- ~ AI3+/AI3-

Analog Input Channels

Supports 4-20mA (current loop) or 0-10V (voltage) signals:

– 4-20mA Current Input: Connect signal positive (+) to AIx+, signal negative (-) to AIx-; use 2-wire/4-wire sensor configuration.

– 0-10V Voltage Input: Connect signal positive (+) to AIx+, signal negative (-) to AIx-; ensure signal source is grounded.

– Use shielded twisted-pair cable (wire gauge: 0.2-0.5mm²); maximum cable length: 100m.

– Shield layer connected to PE at the PLC end (single-point grounding).

AO0+/AO0- ~ AO1+/AO1-

Analog Output Channels

Outputs 4-20mA or 0-10V standard signals:

– Connect output positive (+) to actuator/sensor positive terminal; output negative (-) to corresponding negative terminal.

– Load resistance requirement: 250-600Ω for 4-20mA output; ≥10kΩ for 0-10V output.

5. Communication Interface Wiring

5.1 PROFINET (Ethernet) Wiring

Terminal Label

Function

Wiring Requirements

X1 (RJ45 Port)

PROFINET/Ethernet Interface

Use Cat5e/Cat6 shielded twisted-pair cable.

– Connect to network switch/router or HMI/PC for programming/communication.

– Comply with IEEE 802.3 standard; maximum cable length per segment: 100m.

– Shield layer grounded at both ends for industrial environments.

5.2 RS485 (Modbus RTU) Wiring

Terminal Label	Function	Wiring Requirements
A (Positive)	RS485 Differential Signal+	Connect to “A” terminal of Modbus RTU devices (e.g., sensors, inverters).
B (Negative)	RS485 Differential Signal-	Connect to “B” terminal of Modbus RTU devices.
GND	RS485 Signal Ground	Connect to signal ground of other RS485 devices (optional but recommended for noise reduction).
TER	Termination Resistor	Connect a 120Ω resistor between A and B terminals for long-distance communication (≥50m).

Notes:

RS485 cable: Shielded twisted-pair (wire gauge: 0.5-0.75mm²); maximum cable length: 1200m (9600 bps baud rate).
Avoid daisy-chain connections exceeding 32 devices (use repeaters for expansion).

6. Grounding & Shielding Wiring

Signal Ground (M): Connect all digital/analog signal commons to the PLC’s M terminal (isolated from PE to prevent ground loops).
Shield Ground: Strip 1-2cm of insulation from the cable shield, twist it tightly, and connect to the PLC’s PE terminal or a dedicated shield grounding clamp (single-point grounding is preferred for analog/communication cables).
System Ground: Ensure the PLC’s PE terminal is connected to the factory’s main earthing system (no series connection with other equipment’s grounding).

7. Post-Wiring Checks

Verify all wiring against the terminal diagram to ensure no misconnections or short circuits.
Check terminal screws are tightened to 0.5-0.8N·m (use a torque screwdriver) to prevent loose connections.
Inspect cable insulation for damage; replace any worn or frayed cables.
Confirm the power supply voltage matches the PLC’s rated specification before power-on.

S71201-NANANA PDF

S71201-NANANA

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