Tektronix MSSR-32 32-Channel Solid State I_O Module System for the Metrabus Packing List PA-641 Rev. A User manual
MSSR-3232-ChannelSolidStateI/O
ModuleSystemfortheMetrabus
PackingList
WARNING
This product is not intended for use in circuits carrying voltages in excess of 30V RMS, 42.4V
peak, or 60VDC
Functional description
Keithley’s MSSR-32 is a 32-channel digital I/O interface for the METRABUS industrial data acquisition and control family.
Up to 32 industry standard miniature solid state I/O modules can be mounted on a single board. The MSSR-32 rack uses 4 consecutive addresses in the 64-bit METRABUS address space. This allows up to 16 MSSR-32 boards (512 I/O points) to be connected to a single METRABUS driver card.
The MSSR-32 is divided into four 8-bit ports. Modules can be installed in any combination of inputs and outputs (though programming is simplified if only one type of module is used in any one MSSR-32 8-bit port).
The MSSR-32 uses 5 volt power only, and one or two MSSR-32s can be operated directly from the host computer’s power supply. For larger systems, a MBUS-PWR power supply should be installed.
Specifications
Metrabus address space
4 consecutive addresses
Power requirements
+5V: 700 mA typ, 840 mA max
±15V: Not used
Module output current
Modules rated at 3 Amp max with 5 Amp overload protection fuses on MSSR-32.
Physical
Dimensions: 16 in × 4.75 in (40.63 cm × 12.06 cm)
Operating temp: 0 to +70°C
Storage temp: -20 to 100°C
Humidity: 0 to 90% non-condensing
Available miniature solid state I/O modules
SM-ODC5: Control 3 to 60 VDC at 3 Amps
SM-IDC5: Sense 3.3 to 32 VDC
PA-641 Rev. A / 4-99
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Safety precautions
The following safety precautions should be observed before using this product and any associated instrumentation. Although
some instruments and accessories would normally be used with non-hazardous voltages, there are situations where hazardous
conditions may be present.
This product is intended for use by qualified personnel who recognize shock hazards and are familiar with the safety precautions
required to avoid possible injury. Read the operating information carefully before using the product.
General safety definitions
The types of product users are:
Responsible body is the individual or group responsible for the use and maintenance of equipment, and for ensuring that op-
erators are adequately trained.
Operators use the product for its intended function. They must be trained in electrical safety procedures and proper use of the
instrument. They must be protected from electric shock and contact with hazardous live circuits.
Maintenance personnel perform routine procedures on the product to keep it operating, for example, setting the line voltage
or replacing consumable materials. Maintenance procedures are described in the manual. The procedures explicitly state if the
operator may perform them. Otherwise, they should be performed only by service personnel.
Service personnel are trained to work on live circuits, and perform safe installations and repairs of products. Only properly
trained service personnel may perform installation and service procedures.
If a screw is present, connect it to safety earth ground using the wire recommended in the user documentation.
!
The symbol on an instrument indicates that the user should refer to the operating instructions located in the manual.
The WARNING heading in a manual explains dangers that might result in personal injury or death. Always read the associated
information very carefully before performing the indicated procedure.
The CAUTION heading in a manual explains hazards that could damage the instrument. Such damage may invalidate the war-
ranty.
Installation safety
As described in the International Electrotechnical Commission (IEC) Standard IEC 664, the signal terminals are Installation
Category I and must not be connected to mains.
Do not connect switching cards directly to unlimited power circuits. They are intended to be used with impedance limited sources. NEVER connect switching cards directly to AC mains. When connecting sources to switching cards, install protective devices to limit fault current and voltage to the card.
Operators and maintainers of this product must be protected from electric shock at all times. The responsible body must ensure
that users are prevented access and/or insulated from every connection point. In some cases, connections must be exposed to
potential human contact. Product users in these circumstances must be trained to protect themselves from the risk of electric
shock. If the circuit is capable of operating at or above 1000 volts, no conductive part of the circuit may be exposed.
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