MSSR-32 32-Channel Solid State I/O
Module System for the Metrabus
Packing List
1
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 con-
secutive addresses in the 64-bit METRABUS address space. This allows up to 16 MSSR-32 boards (512 I/O points) to be con-
nected 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 pro-
gramming 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 sup-
ply. 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
