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2 Product Overview
2.1
Hardware Overview
2.1.1
Base Module
The S7-I/O base module is enclosed in a compact, modular
case. This case encloses the central processing unit, power
supply, and discrete inputs and outputs. The device may be
either panel mounted or mounted on a DIN rail. The device
is designed for natural convection cooling.
Two models of the S7-I/O base module are available: one
with AC control power, relay outputs, and type 1 sinking DC
inputs, and one with DC control power, sourcing transistor
outputs, and type 1 sinking DC inputs. The AC control
power model is powered by an 85–264 VAC source at 47–
63 Hz, allowing it to be used in a wide range of locations
where the AC power supply is assured. The DC control
power model is powered by a user-supplied, external, 24
VDC nominal power source, such as a battery. This power
source is ideal in locations where using AC is impractical or
where AC power is likely to be interrupted.
The base module supports up to 14 digital inputs and 10
digital outputs. Expansion modules can be used to provide
additional inputs and outputs. Each digital expansion mod-
ule provides either 8 inputs or 8 outputs. Each analog
expansion module provides 3 inputs. Up to 4 analog mod-
ules and up to any combination of five input and output
modules can be added.
2.1.2
Expansion Modules
Expansion modules increase the number of inputs or out-
puts the S7-I/O device can monitor and control. A maximum
of five digital modules or 4 analog modules, each attached
to the side of the other, can be used with one S7-I/O base
module. When digital and analog modules are used in com-
bination, there can be up to 5 digital and 2 analog modules.
Expansion modules include:
•
Digital Input (AC Power)
•
Digital Input (DC Power)
•
Relay Output (AC Power)
•
Contact Output (DC Power)
•
Analog Input (see section 4.3)
Siemens Energy & Automation, Inc.
2
Product Overview
2.1.3
SEAbus Communications
The S7-I/O device is integrated into the ACCESS system
through its RS-485 communications capability. Up to 32
ACCESS devices, including S7-I/O devices, power meters,
protective relays, and trip devices, can be connected on
one communications loop. Using the SEAbus protocol,
devices can be attached to a loop of twisted-pair cabling up
to 4000 feet long. Four loops can connect to a supervisory
computer via an Isolated Multi-Drop converter (RS-232 to
RS-485). The supervisory computer monitors and controls
devices on the network, including the S7-I/O device, using
WinPM software or other supervisory software. This soft-
ware is described in the next section.
2.2
Software Overview
2.2.1
WinPM Software
The S7-I/O device can be programmed and controlled from
an IBM-compatible personal computer running WinPM
supervisory software. WinPM software is sold separately. In
addition to the S7-I/O device, WinPM monitors and controls
power meters, protection relays, and trip devices in the
ACCESS system. This software includes the following fea-
tures:
•
Configuration of outputs as pulsed or latched, including
pulse duration
•
Descriptive labeling of inputs, outputs, and I/O state
names
•
Remote monitoring of system data in real time
•
Logged events and alarms based on input status,
counters, and output activation
•
Graphical display of input and output status and
counters
•
Graphical buttons to control outputs
•
Export of live and historical data to other programs
Refer to Chapter 5 for a discussion of how WinPM software
configures the device. Refer to Chapter 6 for a discussion of
how WinPM software monitors and controls the S7-I/O
device.
5
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