The 1700M series digital I/O products provide computer monitoring of digital
input and digital output signals
and control of industrial devices through solid state
relays. The status of inputs and outputs is communicated to the host
in either Modbus RTU or DGH ASCII format using RS-232 or RS-485 serial
communications. The 1700M series includes:
D1711M 15
channel I/O module with RS-232 output.
D1712M 15
channel I/O module with RS-485 output.
D1750M 24
channel I/O board with RS-232/RS-485 output.
H1770M 64
channel I/O board with RS-232/RS-485 output.
The D1700M digital I/O modules
allow a single host computer to control thousands of I/O points from one serial
port using RS-485 and repeaters in Modbus RTU format. When using RS-232 in
Modbus format you are limited to one board/ module.
The digital inputs accept a wide signal level input, up to +30Vdc without damage, and
have TTL logic input switching levels. The digital outputs are open-collector transistors
offering the most flexibility for almost any application. The digital outputs will also
sink: 100mA (D1711M/D1712M), making them ideal for controlling solid state relays.
The 1700M series is compatible with all industry standard I/O modules and
I/O racks.
Each 1700M contains
up to 64 bits of digital inputs and outputs. The input or output direction
of each digital bit may be set by the user individually or all at once.
The H1700M digital I/O
boards provide direct interface to industry
standard mounting racks and solid-state relays. Industry standard mounting racks such as the
WRC4-A16H and WRC4-A24H relay mounting boards can be
controlled directly with the H1750M or H1770M digital I/O boards. See Relay Mounting Boards on the
Solid-State Relays page for details.
Many
industrial applications require a 'safe' start-up condition to prevent
accidents at critical points in the process. Each 1700M contains an
initial start-up value which is used to configure the digital outputs on
power up. The initial value is use selectable and stored in EEPROM. Since
each digital output is automatically configured on start-up, no software
initialization routines are required.
The
1700M series contains a user- programmable software timer to provide an
orderly shutdown of the output signal in the event of host computer or
communications failure.
The
D1711M and D1712M contain an onboard events counter that counts up to 10
million transitions that occur on the digital input. The event counter may
be read and cleared by the host computer at any time.
The
D1711M/D1712M digital I/O modules can also be mounted on a DIN-Rail using the
MK-1
mounting kit.
