Introduction

The following four M580 safety I/O modules are certified for use in safety applications:

• BMXSAI0410 (Analog Input)

• BMXSDI1602 (Digital Input)

• BMXSDO0802 (Digital Output)

• BMXSRA0405 (Digital Relay Output)

Use the four safety I/O modules to connect the safety PAC to the sensors and actuators that are part of the safety loop. Each safety I/O module incorporates a dedicated safety processor. You can install these I/O modules in the local backplane or in RIO drops.

Installation and Housing Requirements

Install your M580 safety equipment in a manner that meets:

• The IEC 60950 pollution degree 2 standard for the safety of information technology equipment; and

• IEC 60529 standard for IP54 ingress protection, so that:

  • the presence of dust does not interfere with equipment operation, and

  • splashing water has no harmful effect on the equipment or operations.

Typically these standards are accomplished by placing the safety equipment in a housing, such as a cabinet.

Maximum Operation Altitude

The maximum operating altitude for the M580 safety I/O modules is 2000 m above sea level.

Communication Between the PAC and I/O

The M580 safety CPU and Copro together control all backplane exchanges, while the safety I/O respond to the commands of the CPU and Copro. Safety I/O modules can be installed in either a BMXXBP•••• X Bus rack or a BMEXBP•••• Ethernet rack.

Communications between the safety PAC and safety I/O modules in the local main rack are made via the backplane.

Communications between the safety PAC and safety I/O modules installed in an RIO drop are made through an adapter module installed on the RIO drop, either:

• a BMECRA31210 adapter, for an Ethernet rack, or

• a BMXCRA31210 adapter, for an X Bus rack.

Optionally, you can use BMXNRP0200 or BMXNRP0201 fiber optic repeater modules to extend the physical link between the CPU and Copro in the local rack and the adapter in the RIO drop. Fiber optic repeater modules enhance RIO network noise immunity and increase cabling distance while maintaining the full dynamic range of the network and the safety integrity level.

The communication protocol between the safety I/O and PAC enables their exchanges. It permits both devices to check the accuracy of received data, detect corrupted data, and determine if the transmitting module becomes non-operational. Thus, a safety loop may include any non-interfering RIO adapters and backplane.

External Power Supply Used with Digital Safety I/O

The BMXSDI1602 and BMXSDO0802 digital modules require an 24 Vdc protected extra low voltage (SELV/PELV) external power supply to provide power to sensors and actuators. The safety I/O modules supervise the non-safety process power supply for overvoltage and undervoltage conditions.