Ransburg Serial Digital Module 76911 - Manual (Page 9)

LN-9257-07.1 6
Serial Digital Module - Introduction
MODES OF I/O
The Serial Digital Module may run in three differ-
ent I/O modes:
1. Discrete Inputs
2. Serial Bus
3. Parallel (TTL) Bus (retrofit only)
Discrete 24 VDC Signals
(Replaces 75119-01)
The following settings must be made by the user
to enable this mode:
Switch SW1, Jumper E2 OUT
Valves are actuated by a 24 VDC signal applied
to the 8-pin pluggable terminal strip on the rear
side of the motherboard. The ground reference
for these inputs is the 24 VDC ground terminal.
The actual terminal numbers vary depending on
which motherboard is used. In this mode of op-
eration, the following motherboards may be used:
78145-00, 78147-00, and 74847-00 (retrofit). The
Lockout signal (used to defeat the operation of the
front panel push buttons) is set on each module
by setting SW1-1 to ON.
Serial Bus via the LECU4012 Serial
Node Adapter (SERNA) or the 78553
Node Adapter Plus (NA+)
The following settings must be made by the user
to enable this mode:
Switch SW1, 4 Position Switch OFF (Down
Position), Jumper E2 OUT (2 Position)
In this mode of operation all communication to
the valves is by serial bus from the SERNA (or
NA+) on the 78145-00 or 78147-00 motherboards.
The PLC addressing is shown in the SERNA (or
NA+) manual.
Parallel (TTL) Bus (Replaces 75119-
02)
The following settings must be made by the user
to enable this mode:
Switch SW1, 4 Position Switch ON, Jumper
E2 IN
This mode is for retrofit applications in the 74847-
01 motherboard only. Communication is via the
75586-01 RansPak Node Adapter with A10044-00
Node per Bell Slave Adapter or via the 75584-00
Digital Node Adapter.
Manual Valve Operation
Valves may be manually operated using the black
front panel push buttons. The push buttons re-
quire very little travel and may be operated with
a finger against the panel. If the valve is already
On by an external signal, operation of the manual
push button will turn that valve Off. The manual
push button operation is defeated when in Manual
Lockout mode.