Siemens 6ES7222-1HF22-0XA0 EM222 8DO Relay Module

6ES7222-1HF22-0XA0 SIMATIC S7-200 EM 222 Relay Output Module

Product Introduction

The Siemens 6ES7222-1HF22-0XA0 is a digital output expansion module from the SIMATIC S7-200 family. This EM 222 module features 8 relay outputs, each capable of switching up to 2 A. Its relay design supports both DC and AC loads, providing excellent galvanic isolation and flexibility for controlling diverse field devices.

This module is designed exclusively for use with S7-22X series CPUs, such as the S7-222, S7-224, and S7-226. It connects to the CPU via the expansion bus, increasing the total I/O capacity of your system. Its compact form factor allows for easy installation in space-constrained control cabinets.

Technical Specifications

The 6ES7222-1HF22-0XA0 operates with a load voltage L+ rated at 24 V DC, with a permissible range from 5 V to 30 V DC. For AC loads, it accepts a load voltage L1 from 5 V to 250 V AC, with a frequency range of 47 to 63 Hz. This wide voltage range makes it suitable for global applications.

Power and Current Details

From the backplane bus, the module draws a maximum of 40 mA at 5 V DC. For the relay coils, it consumes up to 72 mA from the load voltage L+, which equates to 9 mA per switched output. Its typical power loss is only 2 W, making it energy-efficient for a relay-based module.

Digital Output Characteristics

This EM 222 provides 8 relay outputs, each with a rated current of 2 A. The minimum load current required for reliable operation is 5 mA, and the residual current for a signal "0" is 0 mA, ensuring complete isolation when the relay is open.

The total current per group reaches up to 8 A across all mounting positions at 40 °C and 55 °C (horizontal installation). This high aggregate current capacity allows the module to drive multiple loads simultaneously.

Relay Durability and Contact Ratings

Relay longevity is a key consideration for this Siemens 6ES7222-1HF22-0XA0. Mechanically, the relays support up to 10 million operating cycles. At the rated load voltage, the contact life is 100,000 cycles, ensuring reliable long-term operation.

The switching capacity for inductive loads is 2 A. For lamp loads, the module supports up to 200 W for AC loads and 30 W for DC loads. This makes it suitable for controlling indicator lights, small motors, and solenoid valves.

Cable Length and Isolation

For output wiring, shielded cables can extend up to 500 meters, while unshielded cables are limited to 150 meters. The module provides potential separation via relays, with isolation between channels in groups of 4. This isolation protects the backplane bus from high-voltage transients.

Diagnostics and Status Indication

Notably, this EM 222 does not include built-in diagnostic functions. There is no short-circuit protection or limitation of inductive shutdown voltage; these must be provided externally. However, each output channel has a green status indicator LED, clearly showing the active state of each relay.

Mechanical and Environmental Data

Physically, the module measures 45 mm in width, 80 mm in height, and 62 mm in depth. It weighs approximately 170 g, making it lightweight and easy to handle. The module operates reliably within an ambient temperature range of 0 °C to 55 °C.

Installation Guidelines

Installing the 6ES7222-1HF22-0XA0 is a straightforward process. First, turn off the power supply to your S7-200 system. Mount the module onto the DIN rail by snapping it into place, or secure it with mounting screws if preferred. Next, connect the plug-in I/O terminals for each output channel, ensuring correct wiring for your specific load type. Remember that relay outputs are polarity-independent for AC loads, but DC loads require correct polarity. Finally, the module is automatically recognized by the CPU; no hardware configuration is required in STEP 7-Micro/WIN.

Packaging List

• Siemens 6ES7222-1HF22-0XA0 EM 222 relay output module (1 unit)

• Labeling strips (1 set)

• Manual (1 copy)

Shipping Method: FedEx, UPS, DHL

Frequently Asked Questions (FAQ)

1. Is the 6ES7222-1HF22-0XA0 compatible with all S7-200 CPUs?
No, this EM 222 module is designed exclusively for S7-22X series CPUs, such as the S7-222, S7-224, and S7-226.

2. Does this Siemens output module include short-circuit protection?
No, short-circuit protection must be provided externally. The module itself does not include this feature.

3. What is the maximum switching frequency for this relay module?
The switching frequency depends on the load type. For resistive loads, the maximum is 2 Hz. For inductive loads, it is 0.5 Hz.

4. Can I switch both AC and DC loads with the 6ES7222-1HF22-0XA0?
Yes, the relay outputs support both 5-30 V DC and 5-250 V AC loads, providing excellent application flexibility.

5. What is the total current capacity per group?
The total current per group is 8 A at both 40 °C and 55 °C (horizontal installation).