GFK-1504N
Chapter 9 Discrete Mixed Modules
9-51
9
IC200MDD851
Mixed Module, Output 12/24 V DC Positive Logic Grouped
16 Points / Input 5/12 V DC Pos/Neg Logic Grouped 16 Points
Discrete input/output module IC200MDD851 provides two groups of 8 discrete
inputs and one group of 16 discrete outputs. Inputs in each group can be either
positive logic inputs that receive current from input devices and return the current
on the common, or negative-logic inputs that receive current from the common
and return current to the input device. Input devices are connected between the
input terminals and common terminals. For the inputs to be compatible with TTL
devices, the negative logic configuration should be used. The outputs are positive
or sourcing type outputs. They switch the loads to the positive side of the DC
supply and thus supply current to the loads.
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OK
IC200MDD851
OUT 12/24DC POS 16PT
IN 5/12DC P/N 16PT
OK
Q
I
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
FLD
PWR
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Power for module operation comes from the backplane. Output loads must be
powered by an external source. Intelligent processing for the module is performed
by the CPU or NIU. The module provides 4 bits of discrete input data and receives
8 bits of discrete output data.
LED Indicators
Individual green LEDs indicate the On/Off states of the output and input points.
Backplane power must be present for LEDs to provide status of inputs. The output
LEDs are dependent on field power, but independent of load conditions. The
green FLD PWR LED is ON when field power is applied to the module. The green
OK LEDs are ON when backplane power is present to the module.
Configuration Parameters
The module’s basic input on/off response time is 0.25 ms. For some applications,
it may be preferable to add additional filtering to compensate for conditions such
as noise spikes or switch bounce. Input filter times of 0ms, 1.0ms, or 7.0ms are
selectable through software configuration, for total response times of 0.25ms,
1.25ms, and 7.25ms respectively. The default is 1.0ms filter time (total response
time is 1.25ms).
