Module Core Function
- Adds one serial communication port to S7-300 PLCs.
- Uses a reliable 20 mA current loop (TTY) interface.
- Talks to old printers, scales, and display terminals.
- Isolated connection protects your PLC.
- Includes setup software on a CD.
Technical Details & Capabilities
- Power & Size:
- Power Source: 5V from the PLC backplane.
- Current Use: Maximum 190 mA.
- Heat: Less than 1 Watt.
- Dimensions: 40mm (W) x 125mm (H) x 120mm (D).
- Weight: About 300 grams.
- Communication Performance:
- Interface: 20 mA TTY (serial).
- Data Speed: 2.4 kbit/s to 19.2 kbit/s.
- Max Cable: 1000 meters (passive).
- Connector: 9-pin D-Sub (female).
- Protocols & Software:
- Supported Protocols: 3964(R) and ASCII.
- Max Message Length: 1024 bytes.
- Printer Drivers: HP, IBM, and others.
- Software Blocks: Included for easy programming.
- Environment:
- Operating Temp: 0°C to 60°C.
- Storage Temp: -40°C to 70°C.
- Built for industrial control panels.
Why You Need This Module
- Connect modern S7-300 PLCs to old serial devices.
- 20mA current loop works in noisy electrical areas.
- Sends data long distances (up to 1 km).
- Print labels or reports directly from the PLC.
- Simple setup with Siemens Step 7 software.
Included Items & Service
- One Siemens CP 340 module (6ES7340-1BH02-0AE0).
- Configuration CD with software and manuals.
- All parts covered by a 12-month warranty.
- Shipped fast worldwide via FedEx, UPS, or DHL.
Frequently Asked Questions
What is a 20mA TTY interface?
It is an old serial standard. It uses a current loop. And it is very good for long wires and noisy places.
Can I connect a modern USB device to it?
No. You need a separate USB-to-20mA converter. This module only speaks the 20mA TTY language.
What does “passive” and “active” cable length mean?
“Active” (100m) means the module powers the loop. “Passive” (1000m) means an external device provides power.
Is the 3964(R) protocol common?
Yes. It is a common Siemens serial protocol. It is good for safe and reliable machine-to-machine chat.
What is a typical wiring mistake?
Connecting the + and – wires backwards on the current loop. This stops all communication. Always check polarity.
Should You Buy This Module?
- You have an S7-300 PLC needing a serial port.
- Your old device only has a 20mA TTY port.
- You need to print from your PLC to an old printer.
- Your cables are long or in an electrically noisy area.
- You want a simple, reliable serial connection.
Contact for support: info@oiltechcontrols.com or +86 158 8020 0923 (WhatsApp).
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